---
id: CVE-2025-12106
title: >-
  Insufficient argument validation in OpenVPN 2.7_alpha1 through 2.7_rc1 allows
  an attacker to trigger a heap buffer over-read when parsing IP addresses
summary: >-
  Insufficient argument validation in OpenVPN 2.7_alpha1 through 2.7_rc1 allows
  an attacker to trigger a heap buffer over-read when parsing IP addresses
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H'
cwe:
  - CWE-126
vendor: openvpn
product: openvpn
affected:
  - openvpn = 2.6.13
  - openvpn = 2.7
published: '2025-12-01'
updated: '2026-09-26'
sourceUpdated: '2026-09-26T00:10:00.127'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-12106'
references:
  - url: 'https://community.openvpn.net/Security%20Announcements/CVE-2025-12106'
    label: security@openvpn.net
  - url: >-
      https://www.mail-archive.com/openvpn-announce@lists.sourceforge.net/msg00152.html
    label: security@openvpn.net
tags:
  - nvd
epss: 0.00556
epssPercentile: 0.4399
ingestedAt: '2026-09-26T00:22:39.981Z'
---

## Overview

Insufficient argument validation in OpenVPN 2.7_alpha1 through 2.7_rc1 allows an attacker to trigger a heap buffer over-read when parsing IP addresses

## Affected

- `openvpn = 2.6.13`
- `openvpn = 2.7`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.