How to fix CVE-2025-12106?

Within 24 hours: Identify all systems running OpenVPN 2.7_alpha1 through 2.7_rc1 and assess exposure; implement network segmentation to restrict OpenVPN access to trusted sources only. Within 7 days: Develop rollback plan to prior stable OpenVPN LTS versions (2.6.x or earlier); conduct impact assessment for migration. Within 30 days: Complete migration to patched or stable OpenVPN version; verify all systems have been upgraded and validate functionality in production.

Is Ubuntu affected by CVE-2025-12106?

A critical vulnerability in OpenVPN versions 2.7_alpha1 through 2.7_rc1 allows remote attackers to trigger memory corruption through malformed IP address parsing, potentially leading to denial of service or code execution.

CVE-2025-12106

EUVD-2025-199988 CRITICAL

2025-12-01 [email protected]

9.1

CVSS 3.1

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

High

Lifecycle Timeline

Patch Released

Mar 31, 2026 - 21:13 nvd

Patch available

Analysis Generated

Mar 15, 2026 - 13:34 vuln.today

EUVD ID Assigned

Mar 15, 2026 - 13:34 euvd

EUVD-2025-199988

CVE Published

Dec 01, 2025 - 13:16 nvd

CRITICAL 9.1

Description

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

Analysis

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

Technical Context

This vulnerability is classified as Buffer Over-read (CWE-126).

Affected Products

Affected products: Openvpn Openvpn 2.6.13

Remediation

Monitor vendor advisories for patches. Apply mitigations such as network segmentation, access restrictions, and monitoring.

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +0.1

CVSS: +46

POC: 0

Vendor Status

Ubuntu

Priority: Medium

openvpn

Release	Status	Version
trusty	not-affected	code not present
xenial	not-affected	code not present
bionic	not-affected	code not present
focal	not-affected	code not present
jammy	not-affected	code not present
noble	not-affected	code not present
plucky	not-affected	code not present
questing	not-affected	code not present
upstream	not-affected	debian: Vulnerable code only in 2.7 upstream

Debian

openvpn

Release	Status	Fixed Version	Urgency
bullseye	fixed	2.5.1-3	-
bullseye (security)	fixed	2.5.1-3+deb11u2	-
bookworm, bookworm (security)	fixed	2.6.3-1+deb12u4	-
trixie (security), trixie	fixed	2.6.14-1+deb13u1	-
forky, sid	fixed	2.7.0-1	-
(unstable)	not-affected	-	-

CVE-2025-12106 vulnerability details – vuln.today

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CVE-2025-12106

CVSS Vector

Lifecycle Timeline

Tags

Description

Analysis

Technical Context

Affected Products

Remediation

Priority Score

Vendor Status

Ubuntu

Debian

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CVE-2025-12106

CVSS Vector

Lifecycle Timeline

Tags

Description

Analysis

Technical Context

Affected Products

Remediation

Priority Score

Vendor Status

Ubuntu

Debian

Share

External POC / Exploit Code