Rockwell Automation ControlLogix Communication Modules Major Non-Recoverable Fault Vulnerability

A vulnerability exists in the protected mode of Rockwell Automation's 1756-EN4TR and 1756-EN2TR communication modules. A Concurrent Forward Close operation can trigger a Major Non-Recoverable (MNFR) fault, leading to unexpected system crashes and loss of device availability.

Impact

Exploitation of this vulnerability causes a Major Non-Recoverable (MNFR) fault, which is a critical fault condition within industrial control systems. This fault can lead to unexpected system crashes and a loss of availability of the affected device.

Remediation

Users can upgrade to version 7.001 or later to address this vulnerability. For those unable to upgrade, Rockwell Automation recommends following their security best practices.