NULL pointer dereference in CODESYS products - CVE-2021-29241

Vulnerability identifier: #VU55243

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-29241

CWE-ID: CWE-476

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error in the CmpGateway component. A remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack.

CODESYS Gateway V3
CODESYS Control V3 Runtime System Toolkit
CODESYS Development System
CODESYS Edge Gateway for Windows
CODESYS Edge Gateway for Linux

Install update from vendor's website.

CODESYS Gateway V3 - update to 3.5.17.0
CODESYS Control V3 Runtime System Toolkit - update to 3.5.17.0
CODESYS Development System - update to 3.5.17.0
CODESYS Edge Gateway for Windows - update to 3.5.17.0
CODESYS Edge Gateway for Linux - update to 4.1.0.0

• https://customers.codesys.com/index.php
• https://www.codesys.com/security/security-reports.html
• https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=14637&token=8dbd75ae7553ae3be25e22f741db783b31e14799&download=

• Denial of service in CODESYS V3 products