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.
Advisories
Source ID Title
Debian DLA Debian DLA DLA-4359-1 strongswan security update
Debian DSA Debian DSA DSA-6041-1 strongswan security update
Ubuntu USN Ubuntu USN USN-7841-1 strongSwan vulnerability
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Fri, 16 Jan 2026 19:30:00 +0000

Type Values Removed Values Added
References

Fri, 16 Jan 2026 19:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Fri, 16 Jan 2026 18:45:00 +0000

Type Values Removed Values Added
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.
First Time appeared Strongswan
Strongswan strongswan
Weaknesses CWE-191
CPEs cpe:2.3:a:strongswan:strongswan:*:*:*:*:*:*:*:*
Vendors & Products Strongswan
Strongswan strongswan
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'}


Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-01-16T19:07:43.455Z

Reserved: 2025-10-10T00:00:00.000Z

Link: CVE-2025-62291

cve-icon Vulnrichment

Updated: 2026-01-16T19:07:43.455Z

cve-icon NVD

Status : Received

Published: 2026-01-16T19:16:18.163

Modified: 2026-01-16T19:16:18.163

Link: CVE-2025-62291

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses