CVE-2020-6111: Rockwellautomation Micrologix 1100 B Firmware

High severity, CVSS 7.5. EPSS: 5.6% chance of exploitation in the next 30 days.

An exploitable denial-of-service vulnerability exists in the IPv4 functionality of Allen-Bradley MicroLogix 1100 Programmable Logic Controller Systems Series B FRN 16.000, Series B FRN 15.002, Series B FRN 15.000, Series B FRN 14.000, Series B FRN 13.000, Series B FRN 12.000, Series B FRN 11.000 and Series B FRN 10.000. A specially crafted packet can cause a major error, resulting in a denial of service. An attacker can send a malicious packet to trigger this vulnerability.

Affected products

• Rockwellautomation Micrologix 1100 B Firmware: version 10.000 only; version 11.000 only; version 12.000 only; version 13.000 only; version 14.000 only; version 15.000 only; …

Published 2020-12-03. Last modified 2026-06-17.