What’s Vulnerable › Vulnerabilities

CVE-2025-62291

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-01-16 · updated 2026-06-17
• Weakness: CWE-191

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: from 4.2.12 before 6.0.3 — fixed in 6.0.3

How to fix

Upgrade to a fixed version: strongSwan 6.0.3. Check the vendor advisory for mitigations.

References

• https://github.com/strongswan/strongswan/commits/master/src/libcharon/plugins/eap_mschapv2
• https://github.com/strongswan/strongswan/releases
• 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

Get alerted when CVE-2025-62291 or the next vulnerability affects your stack