CVE-2026-39312

HighCVSS 7.5/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-789

Affected software

Vendor	Product	Versions
SoftEtherVPN	SoftEtherVPN	<= 5.2.5188

References

https://github.com/SoftEtherVPN/SoftEtherVPN/security/advisories/GHSA-q5g3-qhc6-pr3hExploit, Mitigation, Vendor Advisory
https://github.com/SoftEtherVPN/SoftEtherVPN/security/advisories/GHSA-q5g3-qhc6-pr3hExploit, Mitigation, Vendor Advisory

Timeline

Published: Apr 7, 2026
Last modified: Jun 17, 2026
NVD status: Analyzed

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