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 ControlLogix® Platform from Rockwell Automation delivers high-speed, multi-discipline control for discrete, motion, process, and safety applications, featuring enhanced security, integrated motion over EtherNet/IP.
Affected Products and Solution
Affected Product |
CVE |
Affected Firmware Version |
Corrected in Firmware Version |
Affected Catalog Numbers |
ControlLogix® 5580
|
CVE-2026-9636 |
V36-V37 |
V38.011 |
|
CompactLogix® 5380
|
CVE-2026-9636 |
V36-V37 |
V38.011 |
|
GuardLogix® 5580
|
CVE-2026-9636 |
V36-V37
|
V38.011
|
|
Compact GuardLogix® 5380 |
CVE-2026-9636 |
V36-V37
|
V38.011
|
|
1756-EN4TR |
CVE-2026-9636 |
V6.001 V7.001
|
V8.001
|
1756-EN4TR*
|
Security Issue Details for CVE-2026-9636
Category |
Details |
CVE ID |
CVE-2026-9636 |
Impact |
A security issue exists within CompactLogix® 5380, ControlLogix® 5580, and EN4 communication modules related to CIP Security certificate revocation handling. The security issue stems from the controller failing to properly reject certificates signed by an intermediate certificate that has been revoked via a Certificate Revocation List (CRL). This could allow a network-based attacker to establish a connection using a certificate that should be untrusted, potentially bypassing CIP Security protections. |
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.
Important Note:
This vulnerability only affects customers who have the Certificate Revocation List (CRL) feature enabled and are using intermediary certificates. Customers not utilizing this feature are not impacted.
Revision History
Revision |
Date |
Description |
1.0 |
7/14/2026 |
Initial release |
Glossary:
· 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.
· Denial-of-Service (DoS): An attack that disrupts the normal functioning of a system, often by overwhelming it with requests.
· Major Nonrecoverable Fault (MNRF): an error that occurs in a system or device and prevents it from recovering or functioning properly.
· Buffer Overflow: when a program writes more data to a buffer than it can hold, causing the excess data to overflow into adjacent memory locations.
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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
Legal Disclaimer
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