Vulnerability · Published Sep 29, 2025 · Assigned by mitre
CVE-2025-51495
High 7.5
In plain English
A high-severity integer overflow in the swupdate package (Debian). Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | swupdate | no fix listed | DEBIAN-CVE-2025-51495 |
| Debian:13 | swupdate | no fix listed | DEBIAN-CVE-2025-51495 |
| Debian:14 | swupdate | 2025.12+dfsg-1 | DEBIAN-CVE-2025-51495 |
| Ubuntu:22.04:LTS | swupdate | no fix listed | UBUNTU-CVE-2025-51495 |
| Ubuntu:24.04:LTS | swupdate | no fix listed | UBUNTU-CVE-2025-51495 |
| Ubuntu:25.10 | swupdate | no fix listed | UBUNTU-CVE-2025-51495 |
Affected products (as reported)
Weakness: CWE-190 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H