CVE-2026-9637

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.

The Logix® Platform of products listed below 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 Firmware Version

Corrected in Firmware Version

Affected Catalog Numbers

V33 and prior, V34.011-V34.014, V35.011-V35.013, V36.011-V36.012

V37.011, 36.013, 35.014, 34.015

V33 and prior, V34.011-V34.014, V35.011-V35.013, V36.011-V36.012

V37.011, 36.013, 35.014, 34.015

V33 and prior, V34.011-V34.014, V35.011-V35.013, V36.011-V36.012

V37.011, 36.013, 35.014, 34.015

Compact GuardLogix 5380

V33 and prior, V34.011-V34.014, V35.011-V35.013, V36.011-V36.012

V37.011, 36.013, 35.014, 34.015

Security Issue Details for CVE-2026-9637

A denial-of-service security issue exists in the affected Logix platforms listed in the table above. The security issue stems from improper validation of input length during CIP message processing. This can result in a major nonrecoverable fault (MNRF), requiring a power cycle to recover

CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer

Known Exploited Vulnerability

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 .

· 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.

Get Up-to-Date Product Security Information

Visit the Rockwell Automation security advisories on the Trust Center page to:

· Review the current list of Rockwell Automation security advisories

· Report a possible security issue in a Rockwell Automation product

If you have any questions regarding the security issue(s) above and how to mitigate them, TechConnect for help. More information can be found at Us | Rockwell Automation | US.

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