CVE-2025-62291

HIGH
8.1
CVSS Score
Published: January 16, 2026 at 12:00 AM UTC
Updated: June 17, 2026 at 09:51 AM UTC
1 product affected across 1 vendorstrongSwan

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Severity
HIGH8.1
Exploit prediction
EPSS 1.0%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

4.2.12 ≤ v < 6.0.34.2.12
Affected range stops below 6.0.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.1HIGHmitre
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-191

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