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High · 7.5 CVE-2026-39312 EUVD-2026-19804

Pre-Auth EAP-TLS DoS on SoftEther VPN Developer Edition

Published Apr 7, 2026 · Updated Apr 7, 2026 · Assigned by GitHub_M

Description

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.

Affected products

VendorProductAffectedFixed
SoftEtherVPN SoftEtherVPN <= 5.2.5188 —

References