CVE-2026-78221
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 OpenVPN 2.7_alpha1 至 2.7.6 版本中的 Windows 交互服务存在缓冲区大小计算错误，使得经过身份验证的本地用户能够通过精心构造的 NRPT 输入触发内存损坏或泄露敏感信息。
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I. Basic Information for CVE-2026-78221
Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
An incorrect buffer size calculation in the Windows Interactive Service in OpenVPN 2.7_alpha1 through 2.7.6 allows local authenticated users to cause memory corruption or disclose sensitive information via crafted NRPT inputs.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:P/VC:H/VI:N/VA:H/SC:H/SI:N/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
缓冲区大小计算不正确
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-78221
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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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-2026-78043 | 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 weakness: CWE-131
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sonos tract ONNX Initializer Loader tensor.rs from_raw_dt_al -
CVE-2026-70457
rsync 3.2.3 < 3.5.0 Out-of-Bounds Write via parse_size_arg()
V. Comments for CVE-2026-78221
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