CVE-2026-39312
HIGHPre-Auth EAP-TLS DoS on SoftEther VPN Developer Edition
Title source: cnaDescription
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.
References (1)
Core 1
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/SoftEtherVPN/SoftEtherVPN/security/advisories/GHSA-q5g3-qhc6-pr3h
Scores
CVSS v3
7.5
EPSS
0.0045
EPSS Percentile
35.6%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-789
Status
published
Products (2)
softether/softethervpn
< 5.2.5188
SoftEtherVPN/SoftEtherVPN
<= 5.2.5188
Published
Apr 07, 2026
Tracked Since
Apr 07, 2026