---
id: CVE-2025-13086
title: >-
  Improper validation of source IP addresses in OpenVPN version 2.6.0 through
  2.6.15 and 2.7_alpha1 through 2.7_rc1 allows an attacker to open a session
  from a different IP address which did not initiate the connection resulting in
  a denia…
summary: >-
  Improper validation of source IP addresses in OpenVPN version 2.6.0 through
  2.6.15 and 2.7_alpha1 through 2.7_rc1 allows an attacker to open a session
  from a different IP address which did not initiate the connection resulting in
  a denia…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-940
vendor: openvpn
product: openvpn
affected:
  - 'openvpn >= 2.6.0, < 2.6.16'
  - openvpn = 2.7
patched:
  - openvpn 2.6.16
published: '2025-12-03'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T23:10:00.463'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-13086'
references:
  - url: 'https://community.openvpn.net/Security%20Announcements/CVE-2025-13086'
    label: security@openvpn.net
  - url: >-
      https://www.mail-archive.com/openvpn-announce@lists.sourceforge.net/msg00151.html
    label: security@openvpn.net
  - url: >-
      https://www.mail-archive.com/openvpn-announce@lists.sourceforge.net/msg00152.html
    label: security@openvpn.net
tags:
  - nvd
epss: 0.00641
epssPercentile: 0.48556
ingestedAt: '2026-09-25T23:21:16.871Z'
---

## Overview

Improper validation of source IP addresses in OpenVPN version 2.6.0 through 2.6.15 and 2.7_alpha1 through 2.7_rc1 allows an attacker to open a session from a different IP address which did not initiate the connection resulting in a denial of service for the originating client

## Affected

- `openvpn >= 2.6.0, < 2.6.16`
- `openvpn = 2.7`

## Remediation

Upgrade past the affected range:

- `openvpn 2.6.16`