high7.5
CVE-2026-39312
SoftEtherVPN is a an open-source cross-platform multi-protocol VPN Program.
Impact
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
| Vendor | Product | Affected versions |
|---|---|---|
| Softether | Softethervpn | through 5.2.5188 |