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CVE-2026-81738

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.

在 Windows 上使用 tap-windows6 驱动的 OpenVPN 2.5.0 至 2.7.6 版本，允许攻击者通过构造的 DOMAIN-SEARCH 条目触发越界写入漏洞。

CVSS 2.3 · Low

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2026-81738

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
OpenVPN 2.5.0 through 2.7.6 on Windows using the tap-windows6 driver allows attackers to trigger an out-of-bounds write via crafted DOMAIN-SEARCH entries
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:N/VI:L/VA:L/SC:N/SI:L/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenVPN OpenVPN 2.5.0 ~ 2.7.6 -

II. Public POCs for CVE-2026-81738

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-81738

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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-2026-84256 7.7 HIGH OpenVPN 2.1至2.7 Windows参数解析远程命令执行
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-2026-82312 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-121

V. Comments for CVE-2026-81738

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