CVE-2025-62291

Summary

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 Software

Weaknesses

• CWE-191: CWE-191 Integer Underflow (Wrap or Wraparound)

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: total

CVE Program Container

Additional References

• https://lists.debian.org/debian-lts-announce/2025/11/msg00002.html

References

• https://github.com/strongswan/strongswan/releases
• https://github.com/strongswan/strongswan/commits/master/src/libcharon/plugins/eap_mschapv2
• https://www.strongswan.org/blog/2025/10/27/strongswan-vulnerability-%28cve-2025-62291%29.html

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