CVE-2025-14027 Rockwell Automation CVE debrief

Who should care

Industrial control system operators, OT network defenders, plant engineers, system integrators, and asset owners using Rockwell ControlLogix 1756-RM2 or 1756-RM2XT redundancy modules should prioritize this advisory because it affects availability and may disrupt controller redundancy or recovery workflows.

Technical summary

The advisory describes availability-only impact in firmware for ControlLogix redundancy enhanced modules. The issues are reachable through crafted network inputs, including malformed Class 3 messages and resource-exhaustion conditions, and can lead to unresponsiveness or a major nonrecoverable fault. The supplied CVSS vector is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H, matching a network-reachable, unauthenticated denial-of-service condition with high availability impact.

Defensive priority

High for affected OT environments. Even though the issue is limited to availability, the affected modules sit in control-system infrastructure where loss of responsiveness or a fault can disrupt operations and recovery may require a restart.

Recommended defensive actions

• Upgrade from 1756-RM2 to 1756-RM3 as recommended by Rockwell Automation.
• If upgrading is not immediately possible, apply Rockwell and CISA industrial control system security best practices and defense-in-depth measures.
• Limit exposure of affected modules to only necessary, trusted OT network paths and authorized maintenance traffic.
• Review monitoring and incident response procedures for signs of module unresponsiveness, resource exhaustion, or fault conditions.
• Validate recovery procedures, spare-part availability, and restart planning for affected environments.
• Track Rockwell advisory SD1769 and the CISA advisory for any updated remediation guidance.

Evidence notes

The source corpus is a CISA CSAF advisory republishing Rockwell Automation advisory SD1769 on 2026-01-29. The corpus explicitly states the affected products, the denial-of-service mechanism classes, the likely operational outcome, and the primary mitigation path. It also includes official Rockwell remediation URLs and CISA guidance links for ICS recommended practices and defense in depth. The supplied enrichment marks this issue as not listed in CISA KEV.

Official resources