Vulnerability Details CVE-2026-39312
SoftEtherVPN is a an open-source cross-platform multi-protocol VPN Program. In 5.2.5188 and earlier, a pre-authentication denial-of-service vulnerability exists in SoftEther VPN Developer Edition 5.2.5188 (and likely earlier versions of Developer Edition). An unauthenticated remote attacker can crash the vpnserver process by sending a single malformed EAP-TLS packet over raw L2TP (UDP/1701), terminating all active VPN sessions.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 29.8%
CVSS Severity
CVSS v3 Score 7.5
References
Products affected by CVE-2026-39312
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cpe:2.3:a:softether:softethervpn:*