CVE-2025-41739 MEDIUM

CVE-2025-41739: CODESYS Control - Linux/QNX SysSocket flaw

Vendor Codesys
Product CODESYS PLCHandler
Weakness CWE-125
Published December 1, 2025
Last update January 7, 2026

CVSS base score

5.9/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

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

What the vulnerability does

01Description

An unauthenticated remote attacker, who beats a race condition, can exploit a flaw in the communication servers of the CODESYS Control runtime system on Linux and QNX to trigger an out-of-bounds read via crafted socket communication, potentially causing a denial of service.

Key dates

02Disclosure timeline

December 1, 2025 CVE published
January 7, 2026 Record updated