CVE-2025-62291
Heap-based overflow in strongSwan EAP-MSCHAPv2 client from crafted server message.
Is CVE-2025-62291 being exploited?
Not confirmed. CVE-2025-62291 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 1.00% probability of exploitation in the next 30 days.
How severe is CVE-2025-62291?
CVE-2025-62291 is rated High with a CVSS score of 8.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2025-62291?
Yes. A fix has been recorded for CVE-2025-62291. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2025-62291 affect?
CVE-2025-62291 affects strongSwan (client-side EAP-MSCHAPv2), versions < 6.0.3. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2025-62291?
Upgrade to strongSwan 6.0.3+
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote attacker can trigger a heap overflow via crafted EAP-MSCHAPv2 server messages, risking code execution on the VPN client.
Patch when possible
- affected>= 4.2.12 and < 6.0.3
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.