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OpenAdvisories
High · 7.5 CVE-2021-33012 EUVD-2021-19733GHSA-m5fq-q49w-wc2j

Rockwell Automation MicroLogix 1100, all versions, allows a remote, unauthenticated attacker sending specially crafted commands to cause th…

Published Jul 9, 2021 · Updated Jun 3, 2026 · Assigned by icscert

Description

Rockwell Automation MicroLogix 1100, all versions, allows a remote, unauthenticated attacker sending specially crafted commands to cause the PLC to fault when the controller is switched to RUN mode, which results in a denial-of-service condition. If successfully exploited, this vulnerability will cause the controller to fault whenever the controller is switched to RUN mode.

Affected products

VendorProductAffectedFixed
— Rockwell Automation MicroLogix 1100 All Versions —

Advisories 1

References