CVE-2026-39312
Pre-Auth EAP-TLS DoS on SoftEther VPN Developer Edition
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-789 |
| Vendor | softethervpn |
| Product | softethervpn |
| Published | Apr 7, 2026 |
| Last Updated | Apr 7, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
SoftEtherVPN / SoftEtherVPN
<= 5.2.5188