HIGH 8.1 Microsoft
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.
Microsoft Security Update 2026-Jan: 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
- azl3 strongswan 5.9.14-7 on Azure Linux 3.0
- cbl2 strongswan 5.9.10-3 on CBL Mariner 2.0
- azl3 strongswan 5.9.14-8 on Azure Linux 3.0
- cbl2 strongswan 5.9.10-4 on CBL Mariner 2.0
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-62291
- https://nvd.nist.gov/vuln/detail/CVE-2025-62291
This high severity vulnerability with a CVSS score of 8.1 was published on 2026-01-13 via Microsoft. Affected: azl3 strongswan 5.9.14-7 on Azure Linux 3.0, cbl2 strongswan 5.9.10-3 on CBL Mariner 2.0, azl3 strongswan 5.9.14-8 on Azure Linux 3.0 and 1 more.
vulnfeed aggregates 9044 vulnerabilities from NVD, CISA KEV,
Ubuntu, Debian, Red Hat, Kubernetes, Exploit-DB, OSS-Security, GitHub and OpenStack — updated every 4 hours.