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CVE-2026-40215

Quick assessment

Affected
OpenVPN OpenVPN
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.

OpenVPN OpenSource是OpenVPN公司的一个基于 SSL/TLS 协议构建的虚拟专用网络通信软件。 OpenVPN OpenSource存在安全漏洞，该漏洞源于通过TLS握手绕过访问限制，可能导致读取敏感信息。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.59% · P46

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProduct Version RangeStatus
OpenVPN OpenVPN 2.6.0≤ 2.6.19 affected
2.7_alpha1≤ 2.7.1 affected
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I. Basic Information for CVE-2026-40215

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
A race condition in OpenVPN 2.6.0 through 2.6.19 and 2.7_alpha1 through 2.7.1 allows remote attackers to potentially cause a server crash or leak heap memory via a use-after-free triggered during TLS session promotion.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:N/VA:H/SC:L/SI:N/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
OpenVPN OpenSource 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenVPN OpenSource是OpenVPN公司的一个基于 SSL/TLS 协议构建的虚拟专用网络通信软件。 OpenVPN OpenSource存在安全漏洞，该漏洞源于通过TLS握手绕过访问限制，可能导致读取敏感信息。
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
OpenVPN OpenVPN 2.6.0 ~ 2.6.19 -

II. Public POCs for CVE-2026-40215

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-40215

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IV. Related Vulnerabilities

Same product: OpenVPN
Same vendor: OpenVPN
Same weakness: CWE-125

V. Comments for CVE-2026-40215

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