# CVE-2025-62291

## Summary

- **CVE ID:** CVE-2025-62291
- **Severity:** HIGH
- **CVSS Score:** 8.1 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** CWE-191
- **Published:** Jan 16, 2026
- **Last Modified:** Mar 13, 2026

## Description

In the eap-mschapv2 plugin (client-side) in strongSwan before 6.0.3, a malicious EAP-MSCHAPv2 server can send a crafted message of size 6 through 8, and cause an integer underflow that potentially results in a heap-based buffer overflow.

## Affected Products

- strongSwan — strongSwan (4.2.12)

## References

- [CNA](https://github.com/strongswan/strongswan/releases)
- [CNA](https://github.com/strongswan/strongswan/commits/master/src/libcharon/plugins/eap_mschapv2)
- [CNA](https://www.strongswan.org/blog/2025/10/27/strongswan-vulnerability-%28cve-2025-62291%29.html)
- [CVE](https://lists.debian.org/debian-lts-announce/2025/11/msg00002.html)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.93%
- **EPSS Percentile:** 58.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._