Vulnerability in Softether Softethervpn
CVE-2026-39312
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.
EPSS: 0.004 (36.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Softether Softethervpn
- Softethervpn — versions <= 5.2.5188
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-39312?
- CVE-2026-39312 is a high-severity vulnerability in Softether Softethervpn, classified under CWE-789. CVSS score: 7.5/10. Published 2026-04-07.
- How severe is CVE-2026-39312?
- High severity. CVSS v3 base score is 7.5 out of 10.