OpenVPN 2.6.0 < 2.6.21 / 2.7.x < 2.7.5 Multiple Vulnerabilities

critical Nessus Plugin ID 325894

Synopsis

An application on the remote Windows host is affected by multiple vulnerabilities.

Description

According to its self-reported version number, the version of OpenVPN installed on the remote Windows host is affected by multiple vulnerabilities:

- A use-after-free bug in ack_write_buf(), triggerable by a well-timed sequence of control channel and authentication packets. (CVE-2026-12996)

- A use-after-free bug in tls_wrap_reneg(), triggerable by a suitable sequence of dynamic tls-crypt control-channel packets. (CVE-2026-13117)

- A possible 1-byte buffer overrun on NTLMv2 proxy responses. (CVE-2026-11771)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade to OpenVPN 2.6.21, 2.7.5, or later.

Plugin Details

Severity: Critical

ID: 325894

File Name: openvpn_2_6_21.nasl

Version: 1.1

Type: Local

Agent: windows

Family: Windows

Published: 7/9/2026

Updated: 7/9/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.64

CVSS v2

Risk Factor: Medium

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS Score Source: CVE-2026-12996

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Vulnerability Information

CPE: cpe:/a:openvpn:openvpn

Required KB Items: installed_sw/OpenVPN Server

Patch Publication Date: 7/2/2026

Vulnerability Publication Date: 7/2/2026

Reference Information

CVE: CVE-2026-11771, CVE-2026-12932, CVE-2026-12996, CVE-2026-13117, CVE-2026-13122

Detections

Analytics