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Vulnerabilities

Vulnerability · CVE-2026-39312

SoftEtherVPN is a an open-source cross-platform multi-protocol VPN Program.

Published Apr 7, 2026 · catalog updated Jun 17, 2026 · SoftEtherVPN is a an

Check if you run it

No confirmed exploitation is on record for CVE-2026-39312. EPSS is 0.69%. Act only if a listed version of SoftEtherVPN is a an is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (SoftEtherVPN is a an).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.69%
Remediation
Version ranges on file
Affected products
cpe softether/softethervpn · stated softethervpn

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe softether/softethervpnversion unspecified
  • stated softethervpn<= 5.2.5188

How to fix CVE-2026-39312

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-39312. EPSS is 0.69%. Act only if a listed version of SoftEtherVPN is a an is installed.

Which versions are affected?

Compare what you have installed with <= 5.2.5188. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-789. EPSS 0.69%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 7, 2026 · NIST NVD

    Detected

    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), termi

  2. Jun 17, 2026 · NIST NVD

    Updated

    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), termi

Sources

  • CVE.orgVulnerability recordCVE-2026-39312

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-39312

    30-day exploitation probability 0.7%

    first.org
  • NIST NVDVulnerability recordCVE-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 remo

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.