CVE-2025-25567: Softether VPN

Critical severity, CVSS 9.8. EPSS: 0.6% chance of exploitation in the next 30 days.

SoftEther VPN 5.02.5187 is vulnerable to Buffer Overflow in Internat.c via the UniToStrForSingleChars function. NOTE: the Supplier disputes this because the behavior only enables a local user to attack himself through the UI,

Affected products

• Softether VPN: version 5.02.5187 only

Published 2025-03-12. Last modified 2026-06-17.