Rockwell Automation CompactLogix

Summary

Multiple vulnerabilities have been identified in Rockwell Automation CompactLogix controllers, specifically affecting the 5370 L1, L2, and L3 models. Exploitation could lead to denial-of-service conditions by allowing attackers to abuse exposed Connection IDs or bypass integrity checks in the CIP protocol. Rockwell Automation recommends updating to version V38.011 to mitigate these risks.

Full text

ICS Advisory Rockwell Automation CompactLogix Release DateJune 16, 2026 Alert CodeICSA-26-167-04 Related topics: Industrial Control System Vulnerabilities , Industrial Control Systems View CSAF Summary Successful exploitation of these vulnerabilities could allow an attacker to cause a denial-of-service condition. The following versions of Rockwell Automation CompactLogix are affected: CompactLogix 5370 L1 CompactLogix 5370 L2 CompactLogix 5370 L3 CVSS Vendor Equipment Vulnerabilities v3 7.5 Rockwell Automation Rockwell Automation CompactLogix Improper Validation of Integrity Check Value, Exposure of Sensitive System Information to an Unauthorized Control Sphere Background Critical Infrastructure Sectors: Critical Manufacturing Countries/Areas Deployed: Worldwide Company Headquarters Location: United States Vulnerabilities Expand All + CVE-2025-11694 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. View CVE Details Affected Products Rockwell Automation CompactLogix Vendor:Rockwell Automation Product Version:Rockwell Automation CompactLogix 5370 L1: <V38.011, Rockwell Automation CompactLogix 5370 L2: <V38.011, Rockwell Automation CompactLogix 5370 L3: <V38.011 Product Status:known_affected Remediations MitigationRockwell Automation recommends users update to V38.011 https://compatibility.rockwellautomation.com/Pages/MultiProductFindDownloads.aspx?crumb=112&mode=3&refSoft=1&versions=55023,55024,55025,55026,55027,55061https://compatibility.rockwellautomation.com/Pages/MultiProductFindDownloads.aspx?crumb=112&mode=3&refSoft=1&versions=55023,55024,55025,55026,55027,55061 MitigationFor more information, please visit Rockwell Automations SD1776 https://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1776.htmlhttps://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1776.html Relevant CWE: CWE-354 Improper Validation of Integrity Check Value Metrics CVSS Version Base Score Base Severity Vector String 3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H 4.0 8.7 HIGH CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVE-2026-9307 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. View CVE Details Affected Products Rockwell Automation CompactLogix Vendor:Rockwell Automation Product Version:Rockwell Automation CompactLogix 5370 L1: <V38.011, Rockwell Automation CompactLogix 5370 L2: <V38.011, Rockwell Automation CompactLogix 5370 L3: <V38.011 Product Status:known_affected Remediations MitigationRockwell Automation recommends users update to V38.011 https://compatibility.rockwellautomation.com/Pages/MultiProductFindDownloads.aspx?crumb=112&mode=3&refSoft=1&versions=55023,55024,55025,55026,55027,55061https://compatibility.rockwellautomation.com/Pages/MultiProductFindDownloads.aspx?crumb=112&mode=3&refSoft=1&versions=55023,55024,55025,55026,55027,55061 MitigationFor more information, please visit Rockwell Automations SD1776 https://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1776.htmlhttps://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1776.html Relevant CWE: CWE-497 Exposure of Sensitive System Information to an Unauthorized Control Sphere Metrics CVSS Version Base Score Base Severity Vector String 3.1 5.3 MEDIUM CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N 4.0 6.3 MEDIUM CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N Acknowledgments Tyler Lentz of Idaho National Laboratory reported these vulnerabilities to CISA Legal Notice and Terms of Use This product is provided subject to this Notification (https://www.cisa.gov/notification) and this Privacy & Use policy (https://www.cisa.gov/privacy-policy). Recommended Practices CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet. Locate control system networks and remote devices behind firewalls and isolating them from business networks. When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as the connected devices. CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov/ics. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies. CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets. Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies. Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents. CISA also recommends users take the following measures to protect themselves from social engineering attacks: Do not click web links or open attachments in unsolicited email messages. Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams. Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks. No known public exploitation specifically targeting these vulnerabilities has been reported to CISA at this time. Revision History Initial Release Date: 2026-06-16 Date Revision Summary 2026-06-16 1 Initial Republication of Rockwell Automation Security Advisory SD1776 Legal Notice and Terms of Use This product is provided subject to this Notification and this Privacy & Use policy. Vendor Rockwell Automation Tags Sector: Critical Manufacturing Sector Topics: Industrial Control System Vulnerabilities, Industrial Control Systems Please share your thoughts We recently updated our anonymous product survey; we welcome your feedback. Related Advisories Jun 16, 2026 ICS Advisory | ICSA-26-167-03 Rockwell Automation Logix 5370 & 5570 Controllers Vulnerable To Denial of Service Via CIP Jun 16, 2026 ICS Advisory | ICSA-26-167-05 Rockwell Automation FLEX I/O EtherNet/IP Adapters Jun 16, 2026 ICS Advisory | ICSA-26-167-02 Rockwell Automation RSLinx Jun 16, 2026 ICS Advisory | ICSA-26-167-01 Rockwell Automation FactoryTalk Analytics PavilionX

Indicators of Compromise

• cve — CVE-2025-11694
• cve — CVE-2026-9307

Entities