Skip to main content
View

Vulnerability Assessment

Weakness
CWE
CWE-707
ASVS 5.0
V1 - Encoding and Sanitization Improper neutralization
Impact

CVSS score of 7.5 (HIGH). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required.
Exploit ScenarioDerived

This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the high-severity affected system.
This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
Patch available 5.3% exploitation probability (EPSS)

Get an e-mail when this CVE is exploited, patched or re-scored. Free account.

Alert me

AnalysisAI

In nghttp2 before version 1.41.0, the overly large HTTP/2 SETTINGS frame payload causes denial of service. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

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

Sign in to check
Technical ContextAI · show details

This vulnerability is classified under CWE-707. In nghttp2 before version 1.41.0, the overly large HTTP/2 SETTINGS frame payload causes denial of service. The proof of concept attack involves a malicious client constructing a SETTINGS frame with a length of 14,400 bytes (2400 individual settings entries) over and over again. The attack causes the CPU to spike at 100%. nghttp2 v1.41.0 fixes this vulnerability. There is a workaround to this vulnerability. Implement nghttp2_on_frame_recv_callback callback, and if received frame is SETTINGS frame and the number of settings entries are large (e.g., > 32), then drop the connection. Affected products include: Nghttp2, Debian Debian Linux, Opensuse Leap, Fedoraproject Fedora, Oracle Banking Extensibility Workbench. Version information: version 1.41.0.

Know when Nghttp2 gets its next vulnerability

  • Watch products and get an email when something new is published
  • Check this CVE against your own stack and servers
  • Exploit and PoC references, threat intelligence from 22 sources
Continue with Google Continue with GitHub

No credit card · 7-day full trial

Severity by source

NVD PRIMARY 7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

DescriptionNVD

In nghttp2 before version 1.41.0, the overly large HTTP/2 SETTINGS frame payload causes denial of service. The proof of concept attack involves a malicious client constructing a SETTINGS frame with a length of 14,400 bytes (2400 individual settings entries) over and over again. The attack causes the CPU to spike at 100%. nghttp2 v1.41.0 fixes this vulnerability. There is a workaround to this vulnerability. Implement nghttp2_on_frame_recv_callback callback, and if received frame is SETTINGS frame and the number of settings entries are large (e.g., > 32), then drop the connection.

Threat Intelligence Overview

EPSS Score
5.3%
Top 8% exploitable
Data Quality
3 sources
Confidence: Low
NVD CVE.org EPSS 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 HIGH
CISA KEV No
Public POC No
EPSS 5.3%
Patch available Yes
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
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
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact· derived
Medium

Priority Score

43
Low Medium High Critical
KEV: 0
EPSS: +5
CVSS: +38
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

Affected Products (CPE)NVD

cpe:2.3:a:nghttp2:nghttp2:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
cpe:2.3:a:oracle:banking_extensibility_workbench:14.3.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:banking_extensibility_workbench:14.4.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:blockchain_platform:*:*:*:*:*:*:*:*
cpe:2.3:a:oracle:enterprise_communications_broker:3.1.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:enterprise_communications_broker:3.2.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:graalvm:19.3.2:*:*:*:enterprise:*:*:*
cpe:2.3:a:oracle:graalvm:20.1.0:*:*:*:enterprise:*:*:*
cpe:2.3:a:oracle:mysql:*:*:*:*:*:*:*:*
cpe:2.3:a:oracle:mysql:*:*:*:*:*:*:*:*
cpe:2.3:a:oracle:mysql:*:*:*:*:*:*:*:*
cpe:2.3:a:oracle:mysql:*:*:*:*:*:*:*:*
cpe:2.3:a:oracle:mysql:*:*:*:*:*:*:*:*
cpe:2.3:a:nodejs:node.js:*:*:*:*:-:*:*:*
cpe:2.3:a:nodejs:node.js:*:*:*:*:lts:*:*:*
+ 3 more

More in Nghttp2

View all
CVE-2023-44487 HIGH POC
7.5 Oct 10

Denial of service against HTTP/2 server implementations allows remote unauthenticated attackers to exhaust server resour
CVE-2024-28182 MEDIUM
5.3 Apr 04

nghttp2 is an implementation of the Hypertext Transfer Protocol version 2 in C. Rated medium severity (CVSS 5.3), this v
CVE-2026-27135 HIGH POC
7.5 Mar 18

nghttp2 before version 1.68.1 fails to properly validate internal state when session termination APIs are invoked, allow
CVE-2015-8659 CRITICAL
10.0 Jan 12

The idle stream handling in nghttp2 before 1.6.0 allows attackers to have unspecified impact via unknown vectors, aka a

CVE-2026-58055 MEDIUM POC
6.3 Jun 28

HTTP request/response smuggling in nghttpx (the reverse proxy component of nghttp2 through 1.69.0) allows unauthenticate
CVE-2023-35945 HIGH
7.5 Jul 13

Envoy is a cloud-native high-performance edge/middle/service proxy. Rated high severity (CVSS 7.5), this vulnerability i
CVE-2018-1000168 HIGH
7.5 May 08

nghttp2 version >= 1.10.0 and nghttp2 <= v1.31.0 contains an Improper Input Validation CWE-20 vulnerability in ALTSVC fr

Same weakness CWE-707 – Improper Neutralization

View all
CVE-2025-26633 HIGH POC
7.0
CVE-2022-4566 CRITICAL POC
9.8
CVE-2022-4375 CRITICAL POC
9.8
CVE-2022-4277 CRITICAL POC
9.8
CVE-2022-4275 CRITICAL POC
9.8
CVE-2022-4274 CRITICAL POC
9.8
CVE-2022-4257 CRITICAL POC
9.8
CVE-2022-4248 CRITICAL POC
9.8

Same technique Denial Of Service

View all
CVE-2015-5119 CRITICAL POC
9.8
CVE-2011-2462 CRITICAL POC
9.8
CVE-2011-0611 HIGH POC
8.8
CVE-2012-1889 HIGH POC
8.8
CVE-2012-0507 CRITICAL POC
9.8
CVE-2014-1761 HIGH POC
7.8
CVE-2015-5122 CRITICAL POC
9.8
CVE-2011-0609 HIGH POC
7.8

References

Advisories & patches
PATCH https://github.com/nghttp2/nghttp2/commit/336a98feb0d56b9ac54e12736b18785c27f75090 PATCH https://github.com/nghttp2/nghttp2/commit/f8da73bd042f810f34d19f9eae02b46d870af394 PATCH https://github.com/nghttp2/nghttp2/security/advisories/GHSA-q5wr-xfw9-q7xr PATCH https://www.oracle.com/security-alerts/cpuapr2022.html REF http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00024.html REF https://lists.debian.org/debian-lts-announce/2021/10/msg00011.html REF https://lists.debian.org/debian-lts-announce/2023/10/msg00023.html REF https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4OOYAMJVLLCLXDTHW3V5UXNULZBBK4O6/ REF https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AAC2AA36OTRHKSVM5OV7TTVB3CZIGEFL/ REF https://www.debian.org/security/2020/dsa-4696 REF https://www.oracle.com//security-alerts/cpujul2021.html REF https://www.oracle.com/security-alerts/cpujan2021.html REF https://www.oracle.com/security-alerts/cpujul2020.html REF https://www.oracle.com/security-alerts/cpuoct2020.html

Search Externally

GitHub PoC Exploit-DB PacketStorm Snyk Rapid7 Nuclei Templates Trickest PoC
Back

This site uses cookies essential for authentication and security. No tracking or analytics cookies are used. Privacy Policy