CVE-2026-39312CWE-789

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

High · published April 7, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
52.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00695 · 52.4th percentile
Weakness
CWE-789 · Memory Allocation with Excessive Size Value
Published
2026-04-07T16:52Z
EPSS history
Timeline
  • 07 APR 16:52Z
    Pre-Auth EAP-TLS DoS on SoftEther VPN Developer Edition
    cvelistv5