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
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
strongSwan strongSwan
Default version status: unaffected
4.2.12 to < 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 ↗