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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.

OpenVPN是OpenVPN公司开源的一款虚拟专用网络软件。 OpenVPN 2.7_alpha1版本至2.7.6版本存在缓冲区错误漏洞，该漏洞源于Windows Interactive Service中缓冲区大小计算错误，可能导致本地经过身份验证的用户通过特制NRPT输入造成内存损坏或敏感信息泄露。

CVSS 5.9 · Medium EPSS 0.12% · P2

Affected Version Matrix 1

VendorProduct Version RangeStatus
OpenVPN OpenVPN 2.7_alpha1≤ 2.7.6 affected
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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
Vulnerability Title
OpenVPN 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenVPN是OpenVPN公司开源的一款虚拟专用网络软件。 OpenVPN 2.7_alpha1版本至2.7.6版本存在缓冲区错误漏洞，该漏洞源于Windows Interactive Service中缓冲区大小计算错误，可能导致本地经过身份验证的用户通过特制NRPT输入造成内存损坏或敏感信息泄露。
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 2.7_alpha1 ~ 2.7.6 -

II. Public POCs for CVE-2026-78221

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III. Intelligence Information for CVE-2026-78221

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Same Patch Batch · OpenVPN · 2026-09-07 · 9 CVEs total

CVE-2026-84732 8.7 HIGH OpenVPN 数字错误漏洞
CVE-2026-84226 8.5 HIGH OpenVPN 权限许可和访问控制问题漏洞
CVE-2026-84256 7.7 HIGH OpenVPN 命令注入漏洞
CVE-2026-82325 6.8 MEDIUM OpenVPN ovpn-dco-win 资源管理错误漏洞
CVE-2026-78043 5.6 MEDIUM OpenVPN 路径遍历漏洞
CVE-2026-81830 5.6 MEDIUM OpenVPN 输入验证错误漏洞
CVE-2026-81738 2.3 LOW OpenVPN 缓冲区错误漏洞
CVE-2026-82312 1.8 LOW OpenVPN 资源管理错误漏洞

IV. Related Vulnerabilities

Same product: OpenVPN
Same vendor: OpenVPN
Same weakness: CWE-131

V. Comments for CVE-2026-78221

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