CVE-2026-11771

HighCVSS 7.5/10Last modified Aug 5, 2026

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

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-121 CWE-193 CWE-787

Affected software

Vendor	Product	Versions
OpenVPN	OpenVPN	>= 2.1.0, <= 2.6.20; >= 2.7_alpha1, <= 2.7.4

References

https://community.openvpn.net/ReleaseHistory#openvpn-2621-released-1-july-2026Release Notes
https://community.openvpn.net/ReleaseHistory#openvpn-275-released-1-july-2026Release Notes
https://community.openvpn.net/Security%20Announcements/CVE-2026-11771Vendor Advisory

Timeline

Published: Jul 30, 2026
Last modified: Aug 5, 2026
NVD status: Analyzed

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