Debian dla-4653 : openvpn - security update

medium Nessus Plugin ID 323101

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Synopsis

The remote Debian host is missing one or more security-related updates.

Description

The remote Debian 11 host has a package installed that is affected by multiple vulnerabilities as referenced in the dla-4653 advisory.

------------------------------------------------------------------------- Debian LTS Advisory DLA-4653-1 [email protected] https://www.debian.org/lts/security/ Daniel Leidert June 27, 2026 https://wiki.debian.org/LTS
-------------------------------------------------------------------------

Package : openvpn Version : 2.5.1-3+deb11u3 CVE ID : CVE-2026-35058 CVE-2026-40215

Two security vulnerabilities were discovered in OpenVPN,a virtual private network application.

CVE-2026-35058

Improper validation of packet length during tls-crypt-v2 key extraction allows authenticated attackers to trigger a fatal assertion and cause a denial of service via a specially crafted packet.

CVE-2026-40215

A race condition allows remote attackers to potentially cause a server crash or leak heap memory via a use-after-free triggered during TLS session promotion.

For Debian 11 bullseye, these problems have been fixed in version 2.5.1-3+deb11u3.

We recommend that you upgrade your openvpn packages.

For the detailed security status of openvpn please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/openvpn

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS Attachment:
signature.asc Description: This is a digitally signed message part

Tenable has extracted the preceding description block directly from the Debian security advisory.

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

Solution

Upgrade the openvpn packages.

Plugin Details

Severity: Medium

ID: 323101

File Name: debian_DLA-4653.nasl

Version: 1.2

Type: Local

Agent: unix

Family: Debian Local Security Checks

Published: 6/26/2026

Updated: 8/25/2026

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.59

CVSS v2

Risk Factor: High

Base Score: 7.1

Temporal Score: 5.6

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

CVSS Score Source: CVE-2026-40215

CVSS v3

Risk Factor: High

Base Score: 7.4

Temporal Score: 6.7

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

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

CVSS v4

Risk Factor: Medium

Base Score: 6.9

Threat Score: 5.6

Threat Vector: CVSS:4.0/E:P

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

CVSS Score Source: CVE-2026-35058

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:11.0, p-cpe:/a:debian:debian_linux:openvpn

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 6/27/2026

Vulnerability Publication Date: 4/22/2026

Reference Information

CVE: CVE-2026-35058, CVE-2026-40215

Detections

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