#VU51180 Infinite loop in Rockwell Automation products - CVE-2020-6998

Vulnerability identifier: #VU51180

Vulnerability risk: Medium

CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green

CVE-ID: CVE-2020-6998

CWE-ID: CWE-835

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerable software:
Allen-Bradley Armor Compact GuardLogix 5370
Armor GuardLogix Safety Controllers
Allen-Bradley CompactLogix 5370 L1
Allen-Bradley CompactLogix 5370 L2
Allen-Bradley CompactLogix 5370 L3
Allen-Bradley Compact GuardLogix 5370
ControlLogix 5570 controllers

Software vendor:
Rockwell Automation

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

The vulnerability exists due to the connection establishment algorithm does not sufficiently manage its control flow during execution. A remote attacker can send a specially crafted CIP packet and cause denial of service conditions.

Install update from vendor's website.

• https://ics-cert.us-cert.gov/advisories/icsa-21-061-02