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CVE-2026-11771

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是OpenVPN公司开源的一个用于创建虚拟专用网络(VPN)加密通道的软件包,它使用OpenSSL库来加密数据与控制信息,并允许创建的VPN使用公开密钥、电子证书或者用户名/密码来进行身份验证。 OpenVPN 2.1.0版本至2.6.20版本和2.7_alpha1版本至2.7.4版本存在安全漏洞，该漏洞源于NTLM代理身份验证中存在差一错误缓冲区写入，可能导致攻击者通过恶意代理服务器发送特制NTLM响应造成崩溃。

CVSS 7.0 · High EPSS 0.68% · P51

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
OpenVPN OpenVPN 2.1.0≤ 2.6.20 affected
2.7_alpha1≤ 2.7.4 affected
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I. Basic Information for CVE-2026-11771

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
OpenVPN version 2.1.0 through 2.6.20 and 2.7_alpha1 through 2.7.4 allows attackers via an off-by-one buffer write in the NTLM proxy authentication to potentially cause a crash via a crafted NTLM response from a malicious proxy server
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
Off-by-one错误
Source: CVE Program / CVE List V5
Vulnerability Title
OpenVPN 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenVPN是OpenVPN公司开源的一个用于创建虚拟专用网络(VPN)加密通道的软件包,它使用OpenSSL库来加密数据与控制信息,并允许创建的VPN使用公开密钥、电子证书或者用户名/密码来进行身份验证。 OpenVPN 2.1.0版本至2.6.20版本和2.7_alpha1版本至2.7.4版本存在安全漏洞，该漏洞源于NTLM代理身份验证中存在差一错误缓冲区写入，可能导致攻击者通过恶意代理服务器发送特制NTLM响应造成崩溃。
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 2.1.0 ~ 2.6.20 -

II. Public POCs for CVE-2026-11771

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III. Intelligence Information for CVE-2026-11771

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Same Patch Batch · OpenVPN · 2026-07-30 · 5 CVEs total

CVE-2026-12932 7.1 HIGH OpenVPN 资源管理错误漏洞
CVE-2026-12996 6.0 MEDIUM OpenVPN 缓冲区错误漏洞
CVE-2026-13117 6.0 MEDIUM OpenVPN 资源管理错误漏洞
CVE-2026-13379 5.1 MEDIUM OpenVPN 缓冲区错误漏洞

IV. Related Vulnerabilities

Same product: OpenVPN
Same vendor: OpenVPN
Same weakness: CWE-193

V. Comments for CVE-2026-11771

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