CVE-2025-62291

HIGH

strongSwan <6.0.3 - Buffer Overflow

Title source: llm

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.

References (4)

[Various Sources] https://github.com/strongswan/strongswan/releases

[Various Sources] https://www.strongswan.org/blog/2025/10/27/strongswan-vulnerability-%28cve-2025-62291%29.html

[Mailing List] https://lists.debian.org/debian-lts-announce/2025/11/msg00002.html

[Patch] https://github.com/strongswan/strongswan/commits/master/src/libcharon/plugins/eap_mschapv2

Scores

CVSS v3 8.1

EPSS 0.0002

EPSS Percentile 5.8%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Classification

CWE

CWE-191

Status draft

Timeline

Published Jan 16, 2026

Tracked Since Feb 18, 2026