# CVE-2025-51495: swupdate: An integer overflow vulnerability exists in the WebSocket component of Mongoose 7.5 thru 7.17

CVE-2025-51495 is fixed in swupdate on 1 platform by DEBIAN-CVE-2025-51495 (version 2025.12+dfsg-1), released September 29, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2025-51495
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0042
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 29, 2025

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | swupdate Debian 14 | 2025.12+dfsg-1 | [DEBIAN-CVE-2025-51495](https://patchblox.com/security/data/fix/linux/debian-cve-2025-51495.md) | Sep 29, 2025 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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