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CVE-2026-39312— Pre-Auth EAP-TLS DoS on SoftEther VPN Developer Edition

Quick assessment

Affected
SoftEtherVPN SoftEtherVPN
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SoftEther VPN是SoftEther开源的一款免费开源、跨平台、多协议的 VPN 软件。用于提供安全、灵活和高效的网络连接，绕过地理限制。 SoftEther VPN 5.2.5188及之前版本存在安全漏洞，该漏洞源于身份验证前处理畸形EAP-TLS数据包不当，可能导致拒绝服务攻击。

CVSS 7.5 · High EPSS 0.69% · P52

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-39312

Vulnerability Information
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Vulnerability Title
Pre-Auth EAP-TLS DoS on SoftEther VPN Developer Edition
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的内存分配
Source: CVE Program / CVE List V5
Vulnerability Title
SoftEther VPN 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SoftEther VPN是SoftEther开源的一款免费开源、跨平台、多协议的 VPN 软件。用于提供安全、灵活和高效的网络连接，绕过地理限制。 SoftEther VPN 5.2.5188及之前版本存在安全漏洞，该漏洞源于身份验证前处理畸形EAP-TLS数据包不当，可能导致拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
SoftEtherVPN SoftEtherVPN <= 5.2.5188 -

II. Public POCs for CVE-2026-39312

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III. Intelligence Information for CVE-2026-39312

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Vendor Advisories for CVE-2026-39312 (1)

IV. Related Vulnerabilities

Same product: SoftEtherVPN
Same vendor: SoftEtherVPN
Same weakness: CWE-789

V. Comments for CVE-2026-39312

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