The security of our products is important to us as your industrial automation supplier. This security issue was reported from an external source during routine testing and is being reported based on our commitment to customer transparency and improvement of all business environments.
Product Description
The 1756-ENBT module from Rockwell Automation is a ControlLogix® EtherNet/IP bridge that enables communication between Logix 5000® controllers and Ethernet devices
Affected Products and Solution
Affected Product |
CVE |
Affected Firmware Version |
Corrected in Firmware Version |
Affected Catalog Numbers |
1756-ENBT Module |
CVE-2026-84235 |
All versions |
Not available
Upgrade to 1756-EN2T or 1756-EN4TR |
Security Issue Details
Category |
Details |
CVE ID |
CVE-2026-84235 |
Impact |
A denial-of-service security issue exists in the affected product. The security issue stems from a crafted CIP packet being sent crashing the module. The device requires a restart to recover. |
CVSS 3.1 Base Score |
|
CVSS 4.0 Base Score |
|
CWE |
Other |
Known Exploited Vulnerability |
No (Not listed in KEV database) |
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 |
9/1/2026 |
Initial release |
Glossary:
· Denial of Service (DoS): Attack is a malicious attempt to disrupt the normal functioning of a targeted server, service, or network by overwhelming it with a flood of traffic or triggering a crash.
· CIP Packet: Control and Information Protocol is a media independent protocol used for manufacturing automation
Get Up-to-Date Product Security Information
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· Subscribe to product security alerts
· Review the current list of Rockwell Automation security advisories
· Report a possible security issue in a Rockwell Automation product
· Learn more about the vulnerability policy
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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