CVE-2025-62291

State: Published
Severity: 8.1 High
Published: Jan 16, 2026
Updated: Jan 16, 2026
Reserved: Oct 10, 2025

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.

Scores

CVSS	Score	Vector	Source
3.1	8.1 High	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H	mitre

Weaknesses

CWE-191 Integer Underflow (Wrap or Wraparound)

Affected Products

Product	Versions
strongSwanstrongSwan	4.2.12 to before 6.0.3Affected

References

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

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