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CVE-2025-62291

8.1 · HIGH

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…

Published Jan 16, 2026CWE-191EPSS 0.98%

Overview

CVE-2025-62291 is a high-severity vulnerability. It was published on January 16, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/strongswan/strongswan/commits/master/src/libcharon/plugins/eap_mschapv2GitHubgithub.com/strongswan/strongswan/releasesRefwww.strongswan.org/blog/2025/10/27/strongswan-vulnerability-%28cve-2025-62291%29.htmlReflists.debian.org/debian-lts-announce/2025/11/msg00002.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-62291?

CVE-2025-62291 is a high-severity vulnerability. It was published on January 16, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).

How severe is CVE-2025-62291?

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-62291?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-62291?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-62291 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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