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VULNERABILITIES

CVE-2026-11771 Details

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.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://community.openvpn.net/ReleaseHistory#openvpn-2621-released-1-july-2026 [email protected]Release Notes
https://community.openvpn.net/ReleaseHistory#openvpn-275-released-1-july-2026 [email protected]Release Notes
https://community.openvpn.net/Security%20Announcements/CVE-2026-11771 [email protected]Vendor Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-121Stack-based Buffer Overflow[email protected]
CWE-193Off-by-one Error[email protected]
CWE-787Out-of-bounds Write[email protected]

Affected Products

ProductVersions
openvpn openvpn
>= 2.1.0, < 2.6.21
>= 2.7, < 2.7.5

CPE

  • cpe:2.3:a:openvpn:openvpn:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

3 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-11771
NVD Published Date:
Jul 30, 2026
NVD Last Modified:
Aug 5, 2026
Source:
[email protected]
CVE-2026-11771 Details - Not Deferred