CVE-2025-62291

CVE-2025-62291 is a high-severity vulnerability with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-191.

Key facts

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.

Frequently asked questions

What is 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.
How severe is CVE-2025-62291?
CVE-2025-62291 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-62291 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-62291?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-62291 have an EU (EUVD) identifier?
Yes. CVE-2025-62291 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-2870.
When was CVE-2025-62291 published?
CVE-2025-62291 was published on 2026-01-16 and last updated on 2026-06-17.

References

Other CWE-191 (Integer Underflow) vulnerabilities

Browse all CWE-191 (Integer Underflow) vulnerabilities →