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High severity7.5NVD Advisory· Published Apr 7, 2026· Updated Apr 14, 2026

CVE-2026-39312

CVE-2026-39312

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.

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Affected products

2
  • Softethervpn/Softethervpn2 versions
    cpe:2.3:a:softether:softethervpn:*:*:*:*:developer:*:*:*+ 1 more
    • cpe:2.3:a:softether:softethervpn:*:*:*:*:developer:*:*:*range: <=5.2.5188
    • (no CPE)range: <=5.2.5188

Patches

Vulnerability mechanics

References

1

News mentions

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