The security of our products is important to us as your industrial automation supplier. This security issue was found by external researcher Tyler Lentz of Idaho National Laboratory.
Product Description
The 1756-EN2. EN3, and ENBT modules are a family of high-performance ControlLogix® EtherNet/IP bridge modules designed to support scalable connection capacities to meet the needs of various applications
Affected Products and Solution
Affected Product |
CVE |
Affected Firmware Version |
Corrected in Firmware Version |
Affected Catalog Numbers |
1756-EN3
1756-EN2
|
CVE-2026-9653 |
V12.001 and before |
V12.002 |
1756-EN3
1756-EN2 |
1756-ENBT |
CVE-2026-9653
|
V6.006 |
Product is discontinued, fix is unavailable |
1756-ENBT |
Security Issue Details for CVE-2026-9653
Category |
Details |
CVE ID |
CVE-2026-9653 |
Impact |
A denial-of-service security issue exists across all the 1756-EN2, EN3, and ENBT communication module due to improper validation of CIP Implicit Connection packets. An attacker on the network can exploit this by sending crafted packets to continuously disrupt device connections, though device connections will recover immediately after. |
CVSS 3.1 Base Score |
|
CVSS 4.0 Base Score |
|
CWE |
|
Known Exploited Vulnerability |
No |
Mitigations and Workarounds
Customers using the affected software, who are not able to upgrade to one of the corrected versions, should use our security best practices.
Revision History
Revision |
Date |
Description |
1.0 |
7/14/2026 |
Initial release |
Glossary:
· Denial-of-Service (DoS): An attack that disrupts the normal functioning of a system, often by overwhelming it with requests.
· CIP Communication: Common Industrial Protocol (CIP) is a common communication standard that is widely used in industrial automation. Comprises a series of protocols for communication between different devices and systems in automation technology
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Support
If you have any questions regarding the security issue(s) above and how to mitigate them, contact TechConnect for help. More information can be found at Contact Us | Rockwell Automation | US.
If you have any questions regarding this disclosure, please contact PSIRT
Email: rasecure@ra.rockwell.com
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