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Rockwell Automation Logix Platform

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Overview

Rockwell Automation has reported a vulnerability affecting several versions of its Logix Platform, including ControlLogix 5580, CompactLogix 5380, GuardLogix 5580, and Compact GuardLogix 5380. This vulnerability, identified as CVE-2026-9637, stems from improper input length validation during CIP message processing, which can lead to a denial-of-service condition. Affected devices may experience a major nonrecoverable fault, necessitating a power cycle to restore functionality. Users are urged to update their firmware to version V37.011 or higher, or to the latest versions available for their specific product lines to mitigate the risk. This vulnerability poses a significant threat to critical manufacturing sectors worldwide, highlighting the importance of maintaining updated security measures in industrial control systems.

Key Takeaways

  • Affected Systems: Affected products include Rockwell Automation ControlLogix 5580 (<=V33, V34.011-V34.014, V35.011-V35.013, V36.011-V36.012), CompactLogix 5380 (<=V33, V34.011-V34.014, V35.011-V35.013, V36.011-V36.012), GuardLogix 5580 (<=V33, V34.011-V34.014, V35.011-V35.013, V36.011-V36.012), and Compact GuardLogix 5380 (<=V33, V34.011-V34.014, V35.011-V35.013, V36.011-V36.012).
  • Action Required: Users should update to firmware version V37.
  • Timeline: Disclosed on 2026-09-01

Original Article Summary

View CSAF Summary The following versions of Rockwell Automation Logix Platform are affected: ControlLogix 5580 <=V33, V34.011-V34.014, V35.011-V35.013, V36.011-V36.012 (CVE-2026-9637, CVE-2026-9637, CVE-2026-9637, CVE-2026-9637) CompactLogix 5380 <=V33, V34.011-V34.014, V35.011-V35.013, V36.011-V36.012 (CVE-2026-9637, CVE-2026-9637, CVE-2026-9637, CVE-2026-9637) GuardLogix 5580 <=V33, V34.011-V34.014, V35.011-V35.013, V36.011-V36.012 (CVE-2026-9637, CVE-2026-9637, CVE-2026-9637, CVE-2026-9637) Compact GuardLogix 5380 <=V33, V34.011-V34.014, V35.011-V35.013, V36.011-V36.012 (CVE-2026-9637, CVE-2026-9637, CVE-2026-9637, CVE-2026-9637) CVSS Vendor Equipment Vulnerabilities v3 7.5 Rockwell Automation Rockwell Automation Logix Platform Improper Restriction of Operations within the Bounds of a Memory Buffer Background Critical Infrastructure Sectors: Critical Manufacturing Countries/Areas Deployed: Worldwide Company Headquarters Location: United States Vulnerabilities Expand All + CVE-2026-9637 A denial-of-service vulnerability exists in the affected Logix platforms due to improper validation of input length during CIP message processing. This can result in a major nonrecoverable fault (MNRF), requiring a power cycle to recover. View CVE Details Affected Products Rockwell Automation Logix Platform Vendor: Rockwell Automation Product Version: Rockwell Automation ControlLogix 5580 <=V33, Rockwell Automation ControlLogix 5580 V34.011-V34.014, Rockwell Automation ControlLogix 5580 V35.011-V35.013, Rockwell Automation ControlLogix 5580 V36.011-V36.012, Rockwell Automation CompactLogix 5380 <=V33, Rockwell Automation CompactLogix 5380 V34.011-V34.014, Rockwell Automation CompactLogix 5380 V35.011-V35.013, Rockwell Automation CompactLogix 5380 V36.011-V36.012, Rockwell Automation GuardLogix 5580 <=V33, Rockwell Automation GuardLogix 5580 V34.011-V34.014, Rockwell Automation GuardLogix 5580 V35.011-V35.013, Rockwell Automation GuardLogix 5580 V36.011-V36.012, Rockwell Automation Compact GuardLogix 5380 <=V33, Rockwell Automation Compact GuardLogix 5380 V34.011-V34.014, Rockwell Automation Compact GuardLogix 5380 V35.011-V35.013, Rockwell Automation Compact GuardLogix 5380 V36.011-V36.012 Product Status: known_affected Remediations Vendor fix Rockwell Automation recommends users update to firmware version V37.011. Vendor fix Rockwell Automation recommends users update to firmware version 34.015. Vendor fix Rockwell Automation recommends users update to firmware version 35.014. Vendor fix Rockwell Automation recommends users update to firmware version 36.013. Mitigation Customers using the affected software who are not able to upgrade to one of the corrected versions should use Rockwell Automation's security best practices. Relevant CWE: CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer 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 Acknowledgments Rockwell Automation reported this vulnerability 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: 2026-09-01 Date Revision Summary 2026-09-01 1 Initial republication of Rockwell Automation advisory Legal Notice and Terms of Use

Impact

Affected products include Rockwell Automation ControlLogix 5580 (<=V33, V34.011-V34.014, V35.011-V35.013, V36.011-V36.012), CompactLogix 5380 (<=V33, V34.011-V34.014, V35.011-V35.013, V36.011-V36.012), GuardLogix 5580 (<=V33, V34.011-V34.014, V35.011-V35.013, V36.011-V36.012), and Compact GuardLogix 5380 (<=V33, V34.011-V34.014, V35.011-V35.013, V36.011-V36.012).

Exploitation Status

No active exploitation has been reported at this time. However, organizations should still apply patches promptly as proof-of-concept code may exist.

Timeline

Disclosed on 2026-09-01

Remediation

Users should update to firmware version V37.011 or higher. Alternatively, they can upgrade to firmware versions 34.015, 35.014, or 36.013, depending on their product line. For those unable to upgrade, following Rockwell Automation's security best practices is recommended.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to Phishing, CVE, Vulnerability, and 2 more.

Read Original Article

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