Summary
Successful exploitation of this vulnerability could allow an attacker to cause a denial-of-service condition.
The following versions of Rockwell Automation ControlLogix are affected:
- ControlLogix Redundancy Enhanced Module Catalog 1756-RM2 Firmware vers:all/* (CVE-2025-14027)
- ControlLogix Redundancy Enhanced Module Catalog 1756-RM2XT Firmware vers:all/* (CVE-2025-14027)
| CVSS | Vendor | Equipment | Vulnerabilities |
|---|---|---|---|
| v3 7.5 | Rockwell Automation | Rockwell Automation ControlLogix | Missing Release of Memory after Effective Lifetime |
Background
- Critical Infrastructure Sectors: Chemical, Energy, Critical Manufacturing, Food and Agriculture, Transportation Systems, Water and Wastewater
- Countries/Areas Deployed: Worldwide
- Company Headquarters Location: United States
Vulnerabilities
CVE-2025-14027
Multiple denial-of-service issues exist in 1756-RM2 and 1756-RM2XT firmware (ControlLogix Redundancy Enhanced Modules). These issues can be triggered through various crafted inputs, including malformed Class 3 messages, memory leak conditions, and other resource exhaustion scenarios. Exploitation may cause the device to become unresponsive and, in some cases, result in a major nonrecoverable fault. Recovery may require a restart.
Affected Products
Rockwell Automation ControlLogix
Rockwell Automation
Rockwell Automation ControlLogix Redundancy Enhanced Module Catalog 1756-RM2 Firmware: vers:all/*, Rockwell Automation ControlLogix Redundancy Enhanced Module Catalog 1756-RM2XT Firmware: vers:all/*
known_affected
Remediations
Mitigation
Rockwell Automation recommends that users upgrade from the 1756-RM2 to 1756-RM3.
Mitigation
If users are unable to upgrade to the 1756-RM3, security best practices should be applied.
Mitigation
See Rockwell Automation’s SD1769 advisory for more information.
Relevant CWE: CWE-401 Missing Release of Memory after Effective Lifetime
Metrics
| CVSS Version | Base Score | Base Severity | Vector String |
|---|---|---|---|
| 3.1 | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Acknowledgments
- Rockwell Automation reported this vulnerability to CISA
Legal Notice and Terms of Use
This product is provided subject to this Notification (https://www.cisa.gov/notification) and this Privacy & Use policy (https://www.cisa.gov/privacy-policy).
Recommended Practices
CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability, such as:
Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet.
Locate control system networks and remote devices behind firewalls and isolating them from business networks.
When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as the connected devices.
CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov/ics. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.
Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B–Targeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.
No known public exploitation specifically targeting this vulnerability has been reported to CISA at this time.
Revision History
- Initial Release Date: 2026-01-29
| Date | Revision | Summary |
|---|---|---|
| 2026-01-29 | 1 | Initial Republication of Rockwell Automation advisory SD1769 |
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