Detections
Analytics

OpenVPN 2.5.0 < 2.5.12 / 2.6.0 < 2.6.21 / 2.7.x < 2.7.5 Memory Leak DoS

medium Nessus Plugin ID 325893

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Synopsis

An application on the remote Windows host is affected by a denial of service vulnerability.

Description

According to its self-reported version number, the version of OpenVPN installed on the remote Windows host is affected by a denial of service vulnerability:

 - A memory leak in tls-crypt-v2 client key handling allows remote attackers with a valid tls-crypt-v2 client key to potentially cause a denial of service via out-of-memory conditions and subsequent server crashes. (CVE-2026-13698)

Note that Nessus has not tested for this issue 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.

See Also

https://github.com/OpenVPN/openvpn/releases/tag/v2.6.21

https://github.com/OpenVPN/openvpn/releases/tag/v2.7.5

Plugin Details

Severity: Medium

ID: 325893

File Name: openvpn_CVE-2026-13698.nasl

Version: 1.2

Type: Local

Agent: windows

Family: Windows

Published: 7/9/2026

Updated: 7/10/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.77

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2026-13698

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: Medium

Base Score: 6

Threat Score: 2.3

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Vulnerability Information

CPE: cpe:/a:openvpn:openvpn

Required KB Items: installed_sw/OpenVPN Server

Exploit Ease: No known exploits are available

Patch Publication Date: 7/2/2026

Vulnerability Publication Date: 7/2/2026

Reference Information

CVE: CVE-2026-13698