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HTTP Request Smuggling

web HIGH

HTTP request smuggling exploits inconsistencies in how front-end and back-end servers parse HTTP message boundaries.

How It Works

HTTP request smuggling exploits inconsistencies in how front-end and back-end servers parse HTTP message boundaries. When a reverse proxy or load balancer forwards requests to a back-end server, both must agree on where one request ends and the next begins. This boundary is defined by either Content-Length (specifying exact body bytes) or Transfer-Encoding: chunked (indicating variable-length chunks). When servers interpret these headers differently, an attacker can craft a malicious request that appears as one request to the front-end but becomes two requests to the back-end.

The classic CL.TE variant works when the front-end prioritizes Content-Length while the back-end honors Transfer-Encoding. An attacker sends a request with both headers where the Content-Length value is smaller than the actual body. The front-end forwards the entire request, believing it ends earlier than it actually does. The back-end processes the declared content length as one request, then interprets the remaining bytes as the start of a new request—which gets prepended to the next legitimate user's request that arrives.

The TE.CL variant reverses this: the front-end reads chunked encoding while the back-end uses Content-Length. TE.TE attacks exploit even subtler differences—both servers support chunked encoding, but one can be tricked through obfuscation like extra spaces, mixed-case headers, or duplicate Transfer-Encoding directives. The attacker's smuggled request fragment poisons the request stream, affecting whatever user request follows.

Impact

  • Authentication bypass — smuggled requests inherit the authenticated session of the subsequent victim request
  • Request hijacking — capture sensitive data (credentials, tokens, API keys) from other users' requests by smuggling a prefix that logs or reflects their data
  • Web cache poisoning — inject malicious content that gets cached and served to all users accessing that resource
  • Cross-site scripting — smuggle requests that inject JavaScript payloads into responses served to other users
  • Access control circumvention — route requests to restricted endpoints by bypassing front-end security filters

Real-World Examples

Security researchers discovered request smuggling vulnerabilities in major CDN providers and reverse proxies throughout 2019-2020, affecting services that process billions of requests daily. Attackers successfully bypassed WAF protections by smuggling malicious payloads that the security layer never inspected, since the WAF and back-end disagreed on request boundaries.

E-commerce platforms running vulnerable configurations experienced account takeover attacks where smuggled requests captured session tokens from subsequent legitimate user requests, granting attackers full account access without credential theft.

Content delivery networks suffered cache poisoning incidents where attackers smuggled requests causing the CDN to cache malicious JavaScript, which was then served to thousands of users requesting the same resource.

Mitigation

  • Deploy HTTP/2 end-to-end — eliminates ambiguity since HTTP/2 uses binary framing with explicit length prefixes
  • Reject ambiguous requests — drop any request containing both Content-Length and Transfer-Encoding headers
  • Normalize forwarded requests — ensure the front-end rewrites requests to use only one length mechanism before forwarding
  • Disable back-end connection reuse — configure each back-end request to use a fresh connection (reduces performance but prevents smuggling)
  • Use identical HTTP parsing — deploy the same server software for both front-end and back-end tiers

Recent CVEs (299)

EPSS 0% CVSS 5.3
MEDIUM PATCH This Month

Remote attackers can access sensitive information in IBM Verify Identity Access Container 11.0-11.0.2, IBM Security Verify Access Container 10.0-10.0.9.1, and their non-containerized counterparts through HTTP request smuggling. The vulnerability exploits inconsistent HTTP request interpretation between the application and its reverse proxy, allowing unauthenticated remote access to restricted data with low attack complexity.

IBM Information Disclosure Request Smuggling
NVD
EPSS 0% CVSS 6.5
MEDIUM PATCH This Month

HTTP Request Smuggling in cpp-httplib prior to 0.40.0 allows remote attackers to inject arbitrary HTTP requests on HTTP/1.1 keep-alive connections by embedding malicious request data in the body of GET requests that the static file handler does not consume. The unread body bytes remain on the TCP stream and are interpreted as a new request, enabling information disclosure and request manipulation without authentication or user interaction.

Request Smuggling Information Disclosure Cpp Httplib
NVD GitHub VulDB
EPSS 0% CVSS 9.1
CRITICAL Act Now

HTTP request smuggling in Undertow (the embedded web server underpinning JBoss EAP, Red Hat Data Grid, and Apache Camel for Spring Boot) allows remote unauthenticated attackers to bypass front-end security controls by prepending whitespace to header lines. Undertow strips leading spaces from the first header line in violation of RFC 7230, creating a parser discrepancy between upstream proxies and the application server. No public exploit identified at time of analysis, and EPSS sits at 0.13% (32nd percentile), but the CVSS 9.1 and broad Red Hat middleware exposure make this a high-value target for chained attacks.

Information Disclosure Request Smuggling Red Hat Build Of Apache Camel For Spring Boot 4 +11
NVD VulDB
EPSS 0% CVSS 9.1
CRITICAL Act Now

HTTP request smuggling in Undertow allows remote unauthenticated attackers to send `\r\r\r` as a header block terminator, which can desynchronize parsing when Undertow sits behind specific intermediaries such as older Apache Traffic Server or Google Cloud Classic Application Load Balancer. The flaw affects numerous Red Hat distributions of Undertow (JBoss EAP 7/8, Data Grid 8, Fuse 7, Camel for Spring Boot 4, RHEL 8/9/10) and carries a CVSS 9.1, though EPSS is only 0.04% and there is no public exploit identified at time of analysis.

Apache Google Authentication Bypass +13
NVD VulDB
EPSS 0% CVSS 9.1
CRITICAL Act Now

HTTP request smuggling in Red Hat Undertow allows remote unauthenticated attackers to bypass front-end security controls by exploiting parsing discrepancies between Undertow and upstream proxies when handling crafted header names. The flaw (CWE-444) affects Undertow embedded in multiple Red Hat products including JBoss EAP 7/8, Data Grid 8, Fuse 7, and Apache Camel for Spring Boot 4, with Red Hat issuing patches via RHSA-2026:25125 and RHSA-2026:25126. There is no public exploit identified at time of analysis and EPSS is low (0.10%), but CVSS 9.1 and SSVC 'total' technical impact warrant prompt patching of internet-facing deployments.

Authentication Bypass Request Smuggling Red Hat Build Of Apache Camel For Spring Boot 4 +11
NVD VulDB
EPSS 0% CVSS 7.5
HIGH PATCH This Week

CVE-2026-33870 is a security vulnerability (CVSS 7.5). High severity vulnerability requiring prompt remediation.

Docker RCE Python +1
NVD GitHub VulDB
EPSS 0% CVSS 2.9
LOW PATCH Monitor

An HTTP Request/Response Smuggling vulnerability exists in visualfc liteide due to inconsistent interpretation of HTTP requests in the HTTP parser component (http_parser.C), classified under CWE-444. This affects liteide versions before x38.4, allowing attackers to exploit the qjsonrpc HTTP parser module to smuggle malicious requests. An attacker could leverage this vulnerability to perform request smuggling attacks, potentially leading to cache poisoning, session hijacking, or information disclosure depending on the deployment context and HTTP intermediaries involved.

Information Disclosure Request Smuggling Liteide
NVD GitHub VulDB
EPSS 0% CVSS 6.5
MEDIUM POC PATCH This Month

CVE-2026-29057 is a security vulnerability (CVSS 6.5) that allows request smuggling. Remediation should follow standard vulnerability management procedures. Vendor patch is available.

Request Smuggling Authentication Bypass Red Hat
NVD GitHub HeroDevs VulDB
EPSS 0% CVSS 7.0
HIGH PATCH This Week

A critical HTTP Request Smuggling vulnerability exists in Erlang OTP's inets httpd module that allows attackers to desynchronize front-end and back-end servers by exploiting inconsistent Content-Length header parsing. The vulnerability affects Erlang OTP versions from 17.0 through 28.4.0 (inets 5.10 through 9.6.0) and enables attackers to bypass security controls, potentially poisoning web caches or accessing unauthorized resources. While not currently listed in CISA KEV or showing high EPSS scores, the vulnerability has a CVSS 4.0 score of 7.0 and could lead to significant security boundary violations in production environments using affected Erlang-based web services.

Information Disclosure Apache Nginx +2
NVD VulDB GitHub
EPSS 0% CVSS 4.3
MEDIUM This Month

Cisco Secure Firewall ASA and FTD devices with VPN web services enabled are vulnerable to cross-site request forgery (CSRF) attacks due to insufficient HTTP request validation. An attacker can trick users into visiting a malicious website that sends crafted requests to the affected appliance, potentially allowing injection of malicious content reflected back to the victim's browser. No patch is currently available for this vulnerability.

Cisco XSS Request Smuggling +2
NVD VulDB
EPSS 0% CVSS 5.8
MEDIUM This Month

An inconsistent interpretation of http requests ('http request smuggling') vulnerability in Fortinet FortiOS 7.6.0, FortiOS 7.4.0 through 7.4.9, FortiOS 7.2 all versions, FortiOS 7.0 all versions, FortiOS 6.4.3 through 6.4.16 may allow an unauthenticated attacker to smuggle an unlogged http request through the firewall policies via a specially crafted header [CVSS 5.8 MEDIUM]

Fortinet Request Smuggling Information Disclosure
NVD VulDB
EPSS 0% CVSS 5.3
MEDIUM PATCH This Month

HTTP request smuggling in libsoup allows remote attackers to exploit non-compliant chunk header parsing by injecting malformed requests with LF-only line endings instead of proper CRLF formatting. Without requiring authentication, an attacker can cause libsoup to interpret multiple HTTP requests from a single network message, potentially leading to information disclosure. No patch is currently available for this vulnerability.

Information Disclosure Request Smuggling Red Hat +1
NVD VulDB
EPSS 0% CVSS 8.9
HIGH POC PATCH This Week

HTTP request smuggling in H3 framework versions before 1.15.5 allows remote attackers to bypass security controls by exploiting improper case-sensitive validation of the Transfer-Encoding header. The vulnerability enables attackers to inject malicious requests that diverge between client and server parsing, potentially leading to cache poisoning, session hijacking, or other attacks. Public exploit code exists for this vulnerability.

Request Smuggling Information Disclosure H3
NVD GitHub
EPSS 0% CVSS 8.2
HIGH PATCH This Week

HTTP request smuggling in libsoup, GNOME's HTTP client/server library, lets remote unauthenticated attackers exploit inconsistent Host header parsing: libsoup accepts multiple Host: headers and processes the last occurrence, while common front-end proxies honor the first. Supplying duplicate Host headers creates a proxy/backend mismatch enabling vhost confusion, request smuggling, cache poisoning, and bypass of host-based access controls. No public exploit is identified at time of analysis and it is not listed in CISA KEV, but Red Hat has shipped fixes across numerous products (15 RHSA errata).

Request Smuggling Authentication Bypass
NVD
EPSS 1% CVSS 7.5
HIGH POC This Week

OutSystems Platform Server version 11.18.1.37828 is reported to allow denial of service through HTTP request smuggling (CWE-444) by sending a crafted HTTP request where the Content-Length header value does not match the actual body length, disrupting the server's HTTP parser and causing service unavailability. The impact is limited to availability - no confidentiality or integrity exposure is indicated. Critically, the vendor has publicly stated they are unable to reproduce this vulnerability, and the PoC references point exclusively to personal blogs rather than established security research publications, introducing substantial uncertainty about the finding's validity. No public exploit identified at time of analysis has been confirmed by independent researchers or CISA KEV.

Request Smuggling Denial Of Service Platform Server
NVD VulDB
EPSS 0% CVSS 6.9
MEDIUM PATCH This Month

lighttpd1.4.80 incorrectly merged trailer fields into headers after http request parsing. Rated medium severity (CVSS 6.9), this vulnerability is remotely exploitable, no authentication required, low attack complexity. This HTTP Request/Response Smuggling vulnerability could allow attackers to manipulate HTTP request interpretation between frontend and backend servers.

Request Smuggling Authentication Bypass Lighttpd
NVD GitHub VulDB
EPSS 0% CVSS 6.3
MEDIUM POC PATCH This Month

Http4s is a Scala interface for HTTP services. Rated medium severity (CVSS 6.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.

Authentication Bypass Request Smuggling Http4S
NVD GitHub
EPSS 0% CVSS 6.9
MEDIUM This Month

An HTTP Request Smuggling [CWE-444] vulnerability in the Authentication portal of WatchGuard Fireware OS allows a remote attacker to evade request parameter sanitation and perform a reflected. Rated medium severity (CVSS 6.9), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Request Smuggling XSS Watchguard
NVD
EPSS 0% CVSS 2.9
LOW POC PATCH Monitor

Netty is an asynchronous event-driven network application framework for development of maintainable high performance protocol servers and clients. Rated low severity (CVSS 2.9), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.

Request Smuggling Information Disclosure Netty
NVD GitHub
EPSS 0% CVSS 6.3
MEDIUM PATCH This Month

Eventlet is a concurrent networking library for Python. Rated medium severity (CVSS 6.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. This HTTP Request/Response Smuggling vulnerability could allow attackers to manipulate HTTP request interpretation between frontend and backend servers.

Authentication Bypass Request Smuggling Python +3
NVD GitHub
EPSS 0% CVSS 4.0
MEDIUM This Month

Akamai Ghost before 2025-07-21 allows HTTP Request Smuggling via an OPTIONS request that has an entity body, because there can be a subsequent request within the persistent connection between an. Rated medium severity (CVSS 4.0), this vulnerability is remotely exploitable, no authentication required. No vendor patch available.

Request Smuggling Information Disclosure
NVD
EPSS 0% CVSS 4.0
MEDIUM Monitor

An issue was discovered in Akamai Ghost, as used for the Akamai CDN platform before 2025-03-26. Rated medium severity (CVSS 4.0), this vulnerability is remotely exploitable, no authentication required. No vendor patch available.

Request Smuggling Information Disclosure
NVD
EPSS 0% CVSS 4.5
MEDIUM POC PATCH Monitor

EspoCRM is a web application with a frontend designed as a single-page application and a REST API backend written in PHP. Rated medium severity (CVSS 4.5), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available.

Request Smuggling Information Disclosure Espocrm
NVD GitHub
EPSS 0% CVSS 8.6
HIGH PATCH This Month

Spring Cloud Gateway Server forwards the X-Forwarded-For and Forwarded headers from untrusted proxies. Rated high severity (CVSS 8.6), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Information Disclosure Request Smuggling Java +1
NVD HeroDevs
EPSS 1% CVSS 7.4
HIGH PATCH This Month

A request smuggling vulnerability identified within Pingora’s proxying framework, pingora-proxy, allows malicious HTTP requests to be injected via manipulated request bodies on cache HITs, leading to. Rated high severity (CVSS 7.4), this vulnerability is remotely exploitable, no authentication required. No vendor patch available.

Request Smuggling Authentication Bypass Pingora +1
NVD GitHub
EPSS 0% CVSS 6.5
MEDIUM PATCH This Month

A flaw in Node.js 20's HTTP parser allows improper termination of HTTP/1 headers using `\r\n\rX` instead of the required `\r\n\r\n`. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Request Smuggling Authentication Bypass Node.js +2
NVD
EPSS 0% CVSS 8.7
HIGH This Month

A request smuggling vulnerability existed in the Google Cloud Classic Application Load Balancer due to improper handling of chunked-encoded HTTP requests. Rated high severity (CVSS 8.7), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Information Disclosure Google Request Smuggling +1
NVD
EPSS 0% CVSS 5.4
MEDIUM PATCH This Month

Varnish Cache before 7.6.3 and 7.7 before 7.7.1, and Varnish Enterprise before 6.0.13r14, allow client-side desync via HTTP/1 requests, because the product incorrectly permits CRLF to be skipped to. Rated medium severity (CVSS 5.4), this vulnerability is remotely exploitable, no authentication required. No vendor patch available.

Information Disclosure Request Smuggling Red Hat +1
NVD
EPSS 0% CVSS 9.1
CRITICAL Act Now

Radware Cloud Web Application Firewall (WAF) before 2025-05-07 allows remote attackers to bypass firewall filters by placing random data in the HTTP request body when using the HTTP GET method. Rated critical severity (CVSS 9.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Request Smuggling Authentication Bypass Cloud Waf
NVD
EPSS 0% CVSS 9.1
CRITICAL POC PATCH Act Now

h11 is a Python implementation of HTTP/1.1. Rated critical severity (CVSS 9.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Python Request Smuggling Information Disclosure +2
NVD GitHub
EPSS 1% CVSS 7.7
HIGH POC This Week

An issue in OpenResty lua-nginx-module v.0.10.26 and before allows a remote attacker to conduct HTTP request smuggling via a crafted HEAD request. Rated high severity (CVSS 7.7), this vulnerability is remotely exploitable, no authentication required. Public exploit code available and no vendor patch available.

Nginx Request Smuggling Information Disclosure +2
NVD
EPSS 0% CVSS 9.1
CRITICAL POC Act Now

An issue in croogo v.3.0.2 allows an attacker to perform Host header injection via the feed.rss component. Rated critical severity (CVSS 9.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

Request Smuggling Code Injection Croogo
NVD
EPSS 0% CVSS 5.9
MEDIUM PATCH This Month

When using the ch-go library, under a specific condition when the query includes a large, uncompressed malicious external data, it is possible for an attacker in control of such data to smuggle. Rated medium severity (CVSS 5.9), this vulnerability is remotely exploitable. No vendor patch available.

Information Disclosure Request Smuggling Ch +1
NVD GitHub
EPSS 2% CVSS 7.5
HIGH This Week

Apache Traffic Server allows request smuggling if chunked messages are malformed.2.0 through 9.2.9, from 10.0.0 through 10.0.4. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Information Disclosure Apache Request Smuggling +1
NVD
EPSS 0% CVSS 7.5
HIGH PATCH This Week

React Router is a multi-strategy router for React bridging the gap from React 18 to React 19. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Information Disclosure Request Smuggling Red Hat
NVD GitHub
EPSS 0% CVSS 4.7
MEDIUM This Month

IBM Cognos Controller 11.0.0 through 11.1.0 is vulnerable to a Client-Side Desync (CSD) attack where an attacker could exploit a desynchronized browser connection that could lead to further. Rated medium severity (CVSS 4.7), this vulnerability is remotely exploitable, no authentication required. No vendor patch available.

IBM Request Smuggling XSS +2
NVD
EPSS 0% CVSS 5.4
MEDIUM PATCH This Month

Varnish Cache before 7.6.2 and Varnish Enterprise before 6.0.13r10 allow client-side desync via HTTP/1 requests. Rated medium severity (CVSS 5.4), this vulnerability is remotely exploitable, no authentication required. No vendor patch available.

Information Disclosure Request Smuggling Varnish Enterprise +3
NVD
EPSS 0% CVSS 7.5
HIGH PATCH This Week

Gunicorn version 21.2.0 does not properly validate the value of the 'Transfer-Encoding' header as specified in the RFC standards, which leads to the default fallback method of 'Content-Length,'. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Information Disclosure Request Smuggling XSS +3
NVD
EPSS 0% CVSS 9.8
CRITICAL POC Act Now

HTTP Request Smuggling vulnerability in netease-youdao/qanything version 1.4.1 allows attackers to exploit inconsistencies in the interpretation of HTTP requests between a proxy and a server. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

Request Smuggling RCE Authentication Bypass +1
NVD
EPSS 0% CVSS 5.3
MEDIUM This Month

In JetBrains Ktor before 3.1.1 an HTTP Request Smuggling was possible. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Information Disclosure Request Smuggling Ktor
NVD
EPSS 0% CVSS 10.0
CRITICAL Act Now

A critical HTTP Request/Response Smuggling vulnerability (CWE-444) in ithewei libhv library versions up to 1.3.3 allows attackers to manipulate HTTP request interpretation between frontend and backend servers. With a CVSS 4.0 score of 10.0, this vulnerability requires no authentication or user interaction and can be exploited remotely with low complexity. HTTP smuggling attacks can bypass security controls, poison web caches, hijack user sessions, and enable cross-site scripting, making this particularly dangerous in environments using libhv as a reverse proxy or HTTP server component.

Information Disclosure Request Smuggling
NVD GitHub
EPSS 0% CVSS 6.8
MEDIUM This Month

In Perfex Crm < 3.2.1, an authenticated attacker can send a crafted HTTP POST request to the affected upload_sales_file endpoint. Rated medium severity (CVSS 6.8), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.

Request Smuggling RCE
NVD GitHub
EPSS 0% CVSS 7.1
HIGH This Month

A flaw was found in OpenShift Service Mesh 2.6.3 and 2.5.6. Rated high severity (CVSS 7.1), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.

Authentication Bypass Request Smuggling Openshift Service Mesh +1
NVD
EPSS 1% CVSS 7.4
HIGH PATCH This Week

A flaw was found in Quarkus-HTTP, which incorrectly parses cookies with certain value-delimiting characters in incoming requests. Rated high severity (CVSS 7.4), this vulnerability is remotely exploitable, no authentication required. No vendor patch available.

Authentication Bypass Request Smuggling
NVD
EPSS 1% CVSS 5.3
MEDIUM This Month

Inconsistent interpretation of HTTP requests ('HTTP Request/Response Smuggling') issue exists in HAProxy. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Information Disclosure Request Smuggling
NVD
EPSS 0% CVSS 4.7
MEDIUM PATCH This Month

A vulnerability was found in the Keycloak Server. Rated medium severity (CVSS 4.7). No vendor patch available.

Request Smuggling Denial Of Service
NVD VulDB
EPSS 1% CVSS 6.3
MEDIUM PATCH This Month

aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. Rated medium severity (CVSS 6.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. This HTTP Request/Response Smuggling vulnerability could allow attackers to manipulate HTTP request interpretation between frontend and backend servers.

Authentication Bypass Python Request Smuggling +1
NVD GitHub
EPSS 1% CVSS 7.5
HIGH POC This Week

GNOME libsoup before 3.6.0 allows HTTP request smuggling in some configurations because '\0' characters at the end of header names are ignored, i.e., a "Transfer-Encoding\0: chunked" header is. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

Information Disclosure Request Smuggling Libsoup
NVD
EPSS 0% CVSS 7.5
HIGH This Week

kmqtt v0.2.7 is vulnerable to Denial of Service (DoS) due to a Null Pointer Exception. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Denial Of Service Request Smuggling Kmqtt
NVD GitHub VulDB
EPSS 0% CVSS 5.3
MEDIUM This Month

Vulnerability in the Oracle Banking Liquidity Management product of Oracle Financial Services Applications (component: Infrastructure). Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable. No vendor patch available.

Request Smuggling Denial Of Service Oracle +1
NVD
EPSS 0% CVSS 8.9
HIGH This Week

An HTTP Request Smuggling vulnerability in Looker allowed an unauthorized attacker to capture HTTP responses destined for legitimate users. Rated high severity (CVSS 8.9), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Authentication Bypass Request Smuggling Google +1
NVD
EPSS 1% CVSS 5.3
MEDIUM This Month

A vulnerability was found in the resteasy-netty4 library arising from improper handling of HTTP requests using smuggling techniques. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Information Disclosure Request Smuggling
NVD GitHub
EPSS 1% CVSS 5.3
MEDIUM POC This Month

In PHP versions 8.1.* before 8.1.30, 8.2.* before 8.2.24, 8.3.* before 8.3.12, erroneous parsing of multipart form data contained in an HTTP POST request could lead to legitimate data not being. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

PHP Request Smuggling Information Disclosure
NVD GitHub
EPSS 0% CVSS 5.9
MEDIUM This Month

In Mastodon 4.1.6, API endpoint rate limiting can be bypassed by setting a crafted HTTP request header. Rated medium severity (CVSS 5.9), this vulnerability is remotely exploitable. No vendor patch available.

Authentication Bypass Request Smuggling Mastodon
NVD GitHub
EPSS 0% CVSS 4.3
MEDIUM This Month

Loway - CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling'). Rated medium severity (CVSS 4.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Information Disclosure Request Smuggling Queuemetrics
NVD
EPSS 0% CVSS 9.1
CRITICAL Act Now

The pagination class includes arbitrary parameters in links, leading to cache poisoning attack vectors. Rated critical severity (CVSS 9.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Information Disclosure Request Smuggling Joomla
NVD
EPSS 1% CVSS 7.5
HIGH This Week

Apache Traffic Server forwards malformed HTTP chunked trailer section to origin servers. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Apache Request Smuggling Information Disclosure +1
NVD
EPSS 1% CVSS 8.6
HIGH This Week

This vulnerability allows a high-privileged authenticated PAM user to achieve remote command execution on the affected PAM system by sending a specially crafted HTTP request. Rated high severity (CVSS 8.6), this vulnerability is low attack complexity. No vendor patch available.

Information Disclosure Request Smuggling
NVD
EPSS 0% CVSS 7.5
HIGH This Week

Improper handling of requests in Routing Release > v0.273.0 and <= v0.297.0 allows an unauthenticated attacker to degrade the service availability of the Cloud Foundry deployment if performed at. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Information Disclosure Request Smuggling Cf Deployment +1
NVD
EPSS 1% CVSS 8.8
HIGH This Week

HTTP request desynchronization in Ping Identity PingAccess, all versions prior to 8.0.1 affected allows an attacker to send specially crafted http header requests to create a request smuggling. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Information Disclosure Request Smuggling
NVD
EPSS 1% CVSS 7.5
HIGH PATCH This Week

Next.js is a React framework that can provide building blocks to create web applications. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Information Disclosure Request Smuggling Next Js
NVD GitHub
EPSS 1% CVSS 6.3
MEDIUM This Month

Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling') vulnerability in Apache APISIX when using `forward-auth` plugin.8.0, 3.9.0. Rated medium severity (CVSS 6.3), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.

Apache Request Smuggling Information Disclosure +1
NVD
EPSS 1% CVSS 7.5
HIGH This Week

Vulnerability in the Oracle Production Scheduling product of Oracle E-Business Suite (component: Import Utility). Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Authentication Bypass Request Smuggling Oracle +1
NVD
EPSS 3% CVSS 7.5
HIGH PATCH This Week

Gunicorn fails to properly validate Transfer-Encoding headers, leading to HTTP Request Smuggling (HRS) vulnerabilities. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Information Disclosure Request Smuggling
NVD
EPSS 1% CVSS 9.8
CRITICAL PATCH Act Now

TOMP Bare Server implements the TompHTTP bare server. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Information Disclosure Request Smuggling Tomp Bare Server
NVD GitHub
EPSS 1% CVSS 9.8
CRITICAL Act Now

An issue was discovered in Elspec G5 digital fault recorder versions 1.1.4.15 and before. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Buffer Overflow Request Smuggling G5Dfr Firmware
NVD
EPSS 0% CVSS 5.3
MEDIUM This Month

Vulnerability in the Oracle Application Object Library product of Oracle E-Business Suite (component: Login - SSO). Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Request Smuggling Denial Of Service Oracle +1
NVD
EPSS 2% CVSS 7.5
HIGH PATCH This Week

Request smuggling vulnerability in HTTP server in Apache bRPC 0.9.5~1.7.0 on all platforms allows attacker to smuggle request. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. This HTTP Request/Response Smuggling vulnerability could allow attackers to manipulate HTTP request interpretation between frontend and backend servers.

Apache Request Smuggling Information Disclosure +1
NVD GitHub
EPSS 2% CVSS 5.9
MEDIUM PATCH This Month

Puma is a web server for Ruby/Rack applications built for parallelism. Rated medium severity (CVSS 5.9), this vulnerability is remotely exploitable, no authentication required. This HTTP Request/Response Smuggling vulnerability could allow attackers to manipulate HTTP request interpretation between frontend and backend servers.

Request Smuggling Information Disclosure Puma
NVD GitHub
EPSS 0% CVSS 5.3
MEDIUM PATCH This Month

fastify-reply-from is a Fastify plugin to forward the current HTTP request to another server. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. This HTTP Request/Response Smuggling vulnerability could allow attackers to manipulate HTTP request interpretation between frontend and backend servers.

Request Smuggling Authentication Bypass Reply From
NVD GitHub
EPSS 0% CVSS 4.3
MEDIUM This Month

SAP Fiori launchpad - versions SAP_UI 750, SAP_UI 754, SAP_UI 755, SAP_UI 756, SAP_UI 757, SAP_UI 758, UI_700 200, SAP_BASIS 793, allows an attacker to use HTTP verb POST on read-only service causing. Rated medium severity (CVSS 4.3), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.

SAP Information Disclosure Request Smuggling +1
NVD
EPSS 3% CVSS 7.5
HIGH POC PATCH This Week

Improper Input Validation vulnerability in Apache Tomcat.Tomcat from 11.0.0-M1 through 11.0.0-M10, from 10.1.0-M1 through 10.1.15, from 9.0.0-M1 through 9.0.82 and from 8.5.0 through 8.5.95 did not. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

Tomcat Apache Information Disclosure +1
NVD
EPSS 25% CVSS 9.9
CRITICAL KEV THREAT Act Now

Qlik Sense Enterprise for Windows before August 2023 Patch 2 allows unauthenticated remote code execution, aka QB-21683. Rated critical severity (CVSS 9.9), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.

RCE Request Smuggling Microsoft +1
NVD
EPSS 0% CVSS 3.7
LOW PATCH Monitor

yt-dlp is a youtube-dl fork with additional features and fixes. Rated low severity (CVSS 3.7), this vulnerability is remotely exploitable, no authentication required. This HTTP Request/Response Smuggling vulnerability could allow attackers to manipulate HTTP request interpretation between frontend and backend servers.

Information Disclosure Request Smuggling Yt Dlp
NVD GitHub
EPSS 1% CVSS 6.5
MEDIUM POC PATCH This Month

aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.

Python Request Smuggling Open Redirect +1
NVD GitHub
EPSS 1% CVSS 7.5
HIGH POC PATCH This Week

aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.

Python Request Smuggling Information Disclosure +1
NVD GitHub
EPSS 5% CVSS 5.3
MEDIUM This Month

SQUID is vulnerable to HTTP request smuggling, caused by chunked decoder lenience, allows a remote attacker to perform Request/Response smuggling past firewall and frontend security systems. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Information Disclosure Request Smuggling Squid +7
NVD GitHub
EPSS 1% CVSS 5.3
MEDIUM POC PATCH This Month

Twisted is an event-based framework for internet applications. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

Information Disclosure Request Smuggling Twisted
NVD GitHub
EPSS 0% CVSS 5.4
MEDIUM This Month

HPE MSA Controller prior to version IN210R004 could be remotely exploited to allow inconsistent interpretation of HTTP requests. Rated medium severity (CVSS 5.4), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.

Information Disclosure Request Smuggling Msa 1060 Storage Firmware +2
NVD
EPSS 85% 7.5 CVSS 9.9
CRITICAL POC KEV THREAT Emergency

An HTTP Request Tunneling vulnerability found in Qlik Sense Enterprise for Windows for versions May 2023 Patch 3 and earlier, February 2023 Patch 7 and earlier, November 2022 Patch 10 and earlier,. Rated critical severity (CVSS 9.9), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.

Information Disclosure Request Smuggling Microsoft +1
NVD
EPSS 1% CVSS 9.8
CRITICAL PATCH Act Now

Puma is a Ruby/Rack web server built for parallelism. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. This HTTP Request/Response Smuggling vulnerability could allow attackers to manipulate HTTP request interpretation between frontend and backend servers.

Information Disclosure Request Smuggling Puma
NVD GitHub
EPSS 2% CVSS 7.2
HIGH POC PATCH This Week

HAProxy through 2.0.32, 2.1.x and 2.2.x through 2.2.30, 2.3.x and 2.4.x through 2.4.23, 2.5.x and 2.6.x before 2.6.15, 2.7.x before 2.7.10, and 2.8.x before 2.8.2 forwards empty Content-Length. Rated high severity (CVSS 7.2), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.

Information Disclosure Request Smuggling Haproxy
NVD GitHub
EPSS 1% CVSS 9.1
CRITICAL Act Now

Improper Input Validation vulnerability in Apache Software Foundation Apache Traffic Server.2.1. Rated critical severity (CVSS 9.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Apache Information Disclosure Request Smuggling +1
NVD
EPSS 1% CVSS 5.3
MEDIUM PATCH This Month

protocol-http1 provides a low-level implementation of the HTTP/1 protocol. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. This HTTP Request/Response Smuggling vulnerability could allow attackers to manipulate HTTP request interpretation between frontend and backend servers.

Request Smuggling Authentication Bypass Protocol Http1
NVD GitHub
EPSS 0% CVSS 5.3
MEDIUM This Month

VMware Horizon Server contains a HTTP request smuggling vulnerability. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Information Disclosure VMware Request Smuggling +1
NVD
EPSS 1% CVSS 7.5
HIGH POC PATCH This Week

aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.

Python Request Smuggling Information Disclosure +1
NVD GitHub
EPSS 1% CVSS 9.4
CRITICAL Act Now

An unauthenticated attacker in SAP Web Dispatcher - versions WEBDISP 7.49, WEBDISP 7.53, WEBDISP 7.54, WEBDISP 7.77, WEBDISP 7.81, WEBDISP 7.85, WEBDISP 7.88, WEBDISP 7.89, WEBDISP 7.90, KERNEL 7.49,. Rated critical severity (CVSS 9.4), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

SAP Information Disclosure Request Smuggling +1
NVD
EPSS 2% CVSS 9.1
CRITICAL POC Act Now

Emby Server is a user-installable home media server which stores and organizes a user's media files of virtually any format and makes them available for viewing at home and abroad on a broad range of. Rated critical severity (CVSS 9.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Information Disclosure Request Smuggling Emby Releases
NVD GitHub
EPSS 1% CVSS 9.8
CRITICAL Act Now

LavaLite CMS v 9.0.0 was discovered to be vulnerable to web cache poisoning. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Information Disclosure Request Smuggling Lavalite
NVD GitHub
EPSS 3% CVSS 7.3
HIGH This Week

HTTP request/response smuggling vulnerability in HAProxy version 2.7.0, and 2.6.1 to 2.6.7 allows a remote attacker to alter a legitimate user's request. Rated high severity (CVSS 7.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Information Disclosure Request Smuggling Haproxy
NVD
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Quick Facts

Typical Severity
HIGH
Category
web
Total CVEs
299

Related CWEs

MITRE ATT&CK

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