Integer overflow in Strongswan
CVE-2025-62291
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.
EPSS: 0.009 (54.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Strongswan — versions 4.2.12
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2025-62291?
- CVE-2025-62291 is a high-severity vulnerability in Strongswan, classified under Integer Underflow. CVSS score: 8.1/10. Published 2026-01-16.
- How severe is CVE-2025-62291?
- High severity. CVSS v3 base score is 8.1 out of 10.