1756 En2Tr Series C Firmware

A security issue exists in the protected mode of EN4TR devices, where sending specifically crafted messages during a Forward Close operation can cause the device to crash.

Published: 2025-09-09T12:27:48.085Z
Updated: 2025-09-09T13:18:20.601Z

A security issue exists in the protected mode of 1756-EN4TR and 1756-EN2TR communication modules, where a Concurrent Forward Close operation can trigger a Major Non-Recoverable (MNFR) fault. This condition may lead to unexpected system crashes and loss of device availability.

Published: 2025-09-09T12:29:50.522Z
Updated: 2025-09-09T13:14:24.284Z

A buffer overflow vulnerability exists in the Rockwell Automation select 1756-EN* communication devices. If exploited, a threat actor could potentially leverage this vulnerability to perform a remote code execution. To exploit this vulnerability, a threat actor would have to send a maliciously crafted CIP request to device.

Published: 2023-09-20T15:20:23.700Z
Updated: 2024-09-25T15:44:30.367Z

Rockwell Automation MicroLogix 1400 Controllers and 1756 ControlLogix Communications Modules An unauthenticated, remote threat actor could send a CIP connection request to an affected device, and upon successful connection, send a new IP configuration to the affected device even if the controller in the system is set to Hard RUN mode. When the affected device accepts this new IP configuration, a loss of communication occurs between the device and the rest of the system as the system traffic is still attempting to communicate with the device via the overwritten IP address.

Published: 2018-12-07T14:00:00.000Z
Updated: 2026-06-03T13:43:39.921Z