What is the CVSS score of CVE-2025-66570?

CVE-2025-66570 has a CVSS 3.1 base score of 10.0 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N. EPSS exploitation probability: 0.0%.

Is there a public PoC exploit available for CVE-2025-66570?

Yes, a public proof-of-concept exploit is available for CVE-2025-66570. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2025-66570?

Within 24 hours: Identify all internal and external applications using cpp-httplib and document their version numbers and exposure level. Within 7 days: Upgrade cpp-httplib to version 0.27.0 or later across all systems, prioritizing internet-facing and authentication-critical applications. Within 30 days: Conduct security audit of access logs and authorization decisions from the past 90 days to detect potential exploitation, and implement header validation rules at network ingress points.

Docker CVE-2025-66570

Q: Which versions of Docker are affected by CVE-2025-66570?

A critical vulnerability in cpp-httplib (CVE-2025-66570) allows attackers to forge HTTP headers that spoof client IP addresses and network metadata, potentially bypassing authentication,…. A patch is available.

EUVD-2025-201455 CRITICAL

Authentication Bypass by Spoofing (CWE-290)

2025-12-05 security-advisories@github.com

Authentication Bypass Docker Debian Ubuntu Cpp Httplib Suse Yhirose

10.0

CVSS 3.1 · GitHub Advisory

View

Vulnerability Assessment

Weakness	CWE CWE-290 OWASP Top 10:2025 A07:2025 - Authentication Failures ASVS 5.0 V6 - Authentication Anti-spoofing controls MITRE ATT&CK 1 technique across 1 tactic: Defense Evasion The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	Unauthorized access to protected functionality, data, or administrative interfaces, potentially leading to full system compromise. With a CVSS score of 10.0 (CRITICAL), this represents a critical risk.
Exploit ScenarioDerived	An attacker manipulates authentication tokens, exploits logic flaws, or uses default credentials to bypass the login mechanism and access restricted areas.

Act Now Prioritize within 24-48h. Why: CRITICAL severity + public POC available.

Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 15, 2026

cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.27.0, a vulnerability allows attacker-controlled HTTP headers to influence server-visible metadata, logging, and authorization decisions. An attacker can inject headers named REMOTE_ADDR, REMOTE_PORT, LOCAL_ADDR, LOCAL_PORT that are parsed into the request header multimap via read_headers() in httplib.h (headers.emplace), then the server later appends its own internal metadata using the same header names in Server::process_request without erasing duplicates. Because Request::get_header_value returns the first entry for a header key (id == 0) and the client-supplied headers are parsed before server-inserted headers, downstream code that uses these header names may inadvertently use attacker-controlled values. Affected files/locations: cpp-httplib/httplib.h (read_headers, Server::process_request, Request::get_header_value, get_header_value_u64) and cpp-httplib/docker/main.cc (get_client_ip, nginx_access_logger, nginx_error_logger). Attack surface: attacker-controlled HTTP headers in incoming requests flow into the Request.headers multimap and into logging code that reads forwarded headers, enabling IP spoofing, log poisoning, and authorization bypass via header shadowing. This vulnerability is fixed in 0.27.0.

Earlier versions of this analysis (1)

v1 Mar 15, 2026 - 17:08 CVSS 10.0

RemediationAI

A vendor patch is available — apply it immediately. Implement robust authentication mechanisms. Use multi-factor authentication. Review authentication logic for bypass conditions. Remove default credentials.

Affected VersionsENISA

cpp-httplib < 0.27.0

Affected Packages

euvd cpp_httplib fix: 0.27.0

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

An authentication bypass vulnerability allows attackers to circumvent login mechanisms and gain unauthorized access without valid credentials. This vulnerability is classified as Authentication Bypass by Spoofing (CWE-290).

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

GitHub Advisory PRIMARY 10.0 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

Ubuntu HIGH

SUSE 9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

None

Lifecycle Timeline

Patch released

Mar 15, 2026 - 17:08 nvd

Patch available

PoC Detected

Dec 10, 2025 - 15:02 vuln.today

Public exploit code

CVE Published

Dec 05, 2025 - 19:15 nvd

CRITICAL 10.0

Executive ViewAI

Why It Matters

A critical vulnerability in cpp-httplib (CVE-2025-66570) allows attackers to forge HTTP headers that spoof client IP addresses and network metadata, potentially bypassing authentication, authorization, and logging controls. Any application using cpp-httplib versions prior to 0.27.0 is at immediate risk of unauthorized access and audit trail manipulation.

Business Impact: Severe

Compensating Controls

Apply vendor patch to cpp-httplib version 0.27.0 or later. If immediate patching is not feasible: (1) Deploy WAF rules to detect and block requests with REMOTE_ADDR, REMOTE_PORT, LOCAL_ADDR, or LOCAL_PORT headers from untrusted sources; (2) Implement strict header filtering at reverse proxy/load balancer layer to strip client-supplied network metadata headers before reaching the application; (3) Disable any features dependent on these headers until patching is complete; (4) Restrict network access to affected applications to trusted networks only.

Threat Intelligence Overview

EPSS Score

0.0%

Top 87% exploitable

Exploit

POC

Public exploit code exists

Data Quality

6 sources

Confidence: High

EUVD

NVD

CVE.org

EPSS Vendor

GitHub

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity CRITICAL

CISA KEV No

Public POC Yes

EPSS 0.0%

Patch available Yes

Active threat No

Deciding rule

CRITICAL severity + public POC available

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Out-of-Cycle

Exploitation· derived

Poc

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact

Very High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +50

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

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9.3

Vendor StatusVendor

Ubuntu

Priority: High

cpp-httplib

Release	Status	Version
jammy	released	0.10.3+ds-1ubuntu0.1~esm1
noble	released	0.14.3+ds-1.1ubuntu0.1~esm1
plucky	released	0.18.7-1ubuntu0.25.04.1
questing	released	0.18.7-1ubuntu0.25.10.1
upstream	released	0.27.0

USN-7962-1

Debian

Bug #1122027

cpp-httplib

Release	Status	Fixed Version	Urgency
bookworm	vulnerable	0.11.4+ds-1+deb12u1	-
forky, sid, trixie	vulnerable	0.18.7-1	-
(unstable)	fixed	(unfixed)	-

SUSE

Severity: Critical

Product	Status
SUSE Linux Enterprise Server 16.0 SUSE Linux Enterprise Server for SAP applications 16.0	Fixed
openSUSE Leap 16.0	Fixed
openSUSE Tumbleweed	Fixed
SUSE Linux Enterprise Server 16.0	Affected
SUSE Linux Enterprise Server 16.0	Fixed

References

Advisories & patches

PATCH https://github.com/yhirose/cpp-httplib/commit/ac9ebb0ee333ce8bf13523f487bdfad9518a2aff ADVISORY https://ubuntu.com/security/notices/USN-7962-1 ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20090/

Search Externally

GitHub PoC

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Back

SUSE Linux Enterprise Server 16.1	Fixed
SUSE Linux Enterprise Server for SAP applications 16.0	Fixed
SUSE Linux Enterprise Server for SAP applications 16.1	Fixed