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CVE-2026-84256

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 2.1_rc10 至 2.6.22 以及 2.7_alpha1 至 2.7.6 版本在 Windows 平台上存在一个参数解析问题，允许经过身份验证的远程用户通过构造的证书主体执行任意命令。

CVSS 7.7 · High

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2026-84256

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
An argument parsing issue in OpenVPN 2.1_rc10 through 2.6.22 and 2.7_alpha1 through 2.7.6 on Windows allows remote authenticated users to execute arbitrary commands via a crafted certificate subject
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenVPN OpenVPN 2.1_rc10 ~ 2.6.22 -

II. Public POCs for CVE-2026-84256

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III. Intelligence Information for CVE-2026-84256

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Same Patch Batch · OpenVPN · 2026-09-07 · 8 CVEs total

CVE-2026-84732 8.7 HIGH OpenVPN≤2.7.6 ACK重传溢出致拒绝服务
CVE-2026-84226 8.5 HIGH OpenVPN 2.5.0-2.7.6 Windows 本地二进制植入
CVE-2026-78221 5.9 MEDIUM OpenVPN 2.7.6 Windows版缓冲区溢出漏洞
CVE-2026-78043 5.6 MEDIUM OpenVPN 2.7.6 Windows服务本地配置路径绕过
CVE-2026-81830 5.6 MEDIUM OpenVPN 2.4.0-2.6.22 本地服务配置目录约束绕过
CVE-2026-81738 2.3 LOW OpenVPN 2.5.0-2.7.6 Windows版越界写漏洞
CVE-2026-82312 1.8 LOW OpenVPN 2.7.6 Windows IPC空描述符拒绝服务

IV. Related Vulnerabilities

Same product: OpenVPN
Same vendor: OpenVPN
Same weakness: CWE-78

V. Comments for CVE-2026-84256

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