CVE-2025-62291HIGH 8.1EPSS p54.3%

CVE-2025-62291CVE-2025-62291

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.

Scoring

CVSS 3.18.1 (HIGH)
VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS0.88% probability of exploitation · percentile 54.3% · 2026-06-19T12:03:05Z
Published2026-01-16
Last modified2026-04-15

Underlying weaknesses· 1

CWE-191

References

  1. https://github.com/strongswan/strongswan/commits/master/src/libcharon/plugins/eap_mschapv2
  2. https://github.com/strongswan/strongswan/releases
  3. https://www.strongswan.org/blog/2025/10/27/strongswan-vulnerability-%28cve-2025-62291%29.html
  4. https://lists.debian.org/debian-lts-announce/2025/11/msg00002.html

1

TypeTargetConfidenceTier
WeaknessInteger Underflow (Wrap or Wraparound)cwe-1910%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.