The security of our products is important to us as your industrial automation supplier. This security issue was found internally during routine testing and is being reported based on our commitment to customer transparency and improvement of all business environments.
Product Description
The FLEX 5000® EtherNet/IP Adapters from Rockwell Automation are high-performance distributed I/O adapters that connect FLEX 5000® I/O modules to EtherNet/IP networks, supporting advanced network topologies including Device Level Ring (DLR) for industrial automation applications.
Affected Products and Solution
Affected Product |
CVE |
Affected Software Version |
Corrected in Software Version |
Affected Catalog Numbers |
FLEX 5000® Adapter |
CVE-2026-12659 |
v6.011 |
v6.012 |
5094-AENTR |
Security Issue Details for CVE-2026-12659
Category |
Details |
CVE ID |
CVE-2026-12659 |
Impact |
A denial-of-service security issue exists in the affected products. The security issue stems from improper handling of exceptional conditions when processing crafted CIP packets sent to the adapter. A power cycle is required to recover the module and associated I/O.
|
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
· Module: A self-contained unit within a system that performs a specific function and can operate independently or as part of a larger system
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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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