CompactLogix 5370 Controllers – Multiple Vulnerabilities
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 CompactLogix Controller is a modular, mid-range programmable automation controller designed to provide scalable control solutions for machine-level applications, offering integrated motion, Ethernet connectivity, and support for distributed I/O.
Affected Products and Solution
Affected Product |
CVE |
Affected Firmware Version |
Corrected in Firmware Version |
Affected Catalog Numbers |
CompactLogix 5370 L1 CompactLogix 5370 L2 CompactLogix 5370 L3 |
CVE-2025-11694 |
V36 |
1769-L1x, 1769-L2x, 1769-L3x |
|
CompactLogix 5370 L1 CompactLogix 5370 L2 CompactLogix 5370 L3 |
CVE-2026-9307 |
V36 |
1769-L1x, 1769-L2x, 1769-L3x |
Security Issue Details for CVE-2025-11694
Category |
Details |
CVE ID |
CVE-2025-11694 |
Impact |
A security issue exists within 1769 CompactLogix controllers due to the missing validation of sequence numbers and source IP addresses in the CIP protocol. This allows attacker to abuse the exposed Connection ID’s visible on the web interface to perform denial-of-service attacks, resulting in a minor fault. |
CVSS 3.1 Base Score |
|
CVSS 4.0 Base Score |
|
CWE |
|
Known Exploited Vulnerability |
No |
Security Issue Details for CVE-2026-9307
Category |
Details |
CVE ID |
CVE-2026-9307 |
Impact |
A sensitive information disclosure security issue exists within the affected CompactLogix controllers. The controller's web server exposes CIP Connection IDs on the diagnostics webpage, which are accessible to any unauthenticated user on the network. This information can be leveraged by an attacker to construct malicious packets, leading to Denial-of-Service. |
CVSS 3.1 Base Score |
|
CVSS 4.0 Base Score |
|
CWE |
CWE-497: Exposure of Sensitive System Information to an Unauthorized Control Sphere |
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 |
6/16/2026 |
Initial release |
Glossary:
· CIP: 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
· Web Server: Is a software and hardware system that serves content over the internet using the Hypertext Transfer Protocol (HTTP) or its secure version HTTPS. Its primary role is to store, process, and deliver webpages to users' browsers upon request.
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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.
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