Remote Code Execution Vulnerability in Rockwell Automation MicroLogix 1400

CVE-2021-22659

What is CVE-2021-22659?

Rockwell Automation's MicroLogix 1400, particularly Version 21.6 and earlier, is susceptible to a vulnerability that enables remote unauthenticated attackers to exploit specially crafted Modbus packets. This exploitation can lead to unauthorized retrieval and modification of arbitrary values within the device's register. A successful attack may result in a buffer overflow, triggering a denial-of-service state where the FAULT LED signals an issue and communication may cease altogether. Users must actively clear the fault to restore normal operations.

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