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Public proof of conceptFix available

CVE-2025-51495

A public proof of concept exists; no exploitation attested.

  • Published2025-09-29
  • WeaknessCWE-190

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

An integer overflow vulnerability exists in the WebSocket component of Mongoose 7.5 thru 7.17. By sending a specially crafted WebSocket request, an attacker can cause the application to crash. If downstream vendors integrate this component improperly, the issue may lead to a buffer overflow.

Timeline

dates in UTC
  1. 2025-09-2917:15CVE publishedNVD

Versions per branch

NVD
Cesanta mongoose
BranchAffectedFixed in
7.x≥ 7.5, ≤ 7.17no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • swupdateUbuntu:25.10all versions · no fixed version listed
  • swupdateUbuntu:24.04:LTSall versions · no fixed version listed
  • swupdateUbuntu:22.04:LTSall versions · no fixed version listed
  • swupdateDebian:14all versions · fixed in 2025.12+dfsg-1
  • swupdateDebian:13all versions · no fixed version listed
  • swupdateDebian:12all versions · no fixed version listed

Vendor advisories

  • CVE-2025-51495 Red Hat Product Security

    mongoose: Integer Overflow in Mongoose's WebSocket component

Full record on NVD

Fix

Advisories and patches

Detection

read 2026-11-01 01:02 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2025-09-29
Last Modified
2026-11-07
NVD status
Analyzed
GitHub Advisory
GHSA-83rc-g55p-8xj2

Frequently asked questions

What is CVE-2025-51495?

An integer overflow vulnerability exists in the WebSocket component of Mongoose 7.5 thru 7.17. By sending a specially crafted WebSocket request, an attacker can cause the application to crash. If downstream vendors integrate this component improperly, the issue may lead to a buffer overflow.

Is CVE-2025-51495 actively exploited?

A proof-of-concept exploit exists for CVE-2025-51495, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2025-51495?

CVE-2025-51495 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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Sources for this record