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Rockwell Automation ControlLogix, CompactLogix, CompactLogix 5480, GuardLogix, Compact GuardLogix

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Overview

Rockwell Automation has identified a significant vulnerability affecting several of its control systems, including ControlLogix, CompactLogix, CompactLogix 5480, GuardLogix, and Compact GuardLogix. The vulnerability, cataloged as CVE-2021-42260, can lead to a denial of service if maliciously crafted data is sent to these devices, potentially resulting in a major nonrecoverable fault. Users of affected versions, specifically those below firmware versions 34.015, 35.014, 36.013, and 37.011, are urged to update their systems to mitigate the risk. Rockwell Automation recommends applying the latest firmware updates to ensure the security and reliability of these critical manufacturing systems. While there are currently no reports of this vulnerability being actively exploited, organizations should remain vigilant and follow best practices for cybersecurity.

Key Takeaways

  • Affected Systems: Affected products include Rockwell Automation ControlLogix 5580 (versions <34.015, <35.014, <36.013, <37.011), GuardLogix 5580 (versions <34.015, <35.014, <36.013, <37.011), CompactLogix 5380 (versions <34.015, <35.014, <36.013, <37.011), Compact GuardLogix 5380 (versions <34.015, <35.014, <36.013, <37.011), and CompactLogix 5480 (versions <34.015, <35.014, <36.013, <37.011).
  • Action Required: Users should update to firmware version 34.
  • Timeline: Disclosed on October 2023

Original Article Summary

View CSAF Summary The following versions of Rockwell Automation ControlLogix, CompactLogix, CompactLogix 5480, GuardLogix, Compact GuardLogix are affected: ControlLogix 5580 <34.015, <35.014, <36.013, <37.011 (CVE-2021-42260, CVE-2021-42260, CVE-2021-42260, CVE-2021-42260) GuardLogix 5580 <34.015, <35.014, <36.013, <37.011 (CVE-2021-42260, CVE-2021-42260, CVE-2021-42260, CVE-2021-42260) CompactLogix 5380 <34.015, <35.014, <36.013, <37.011 (CVE-2021-42260, CVE-2021-42260, CVE-2021-42260, CVE-2021-42260) Compact GuardLogix 5380 <34.015, <35.014, <36.013, <37.011 (CVE-2021-42260, CVE-2021-42260, CVE-2021-42260, CVE-2021-42260) CompactLogix 5480 <34.015, <35.014, <36.013, <37.011 (CVE-2021-42260, CVE-2021-42260, CVE-2021-42260, CVE-2021-42260) CVSS Vendor Equipment Vulnerabilities v3 7.5 Rockwell Automation Rockwell Automation ControlLogix, CompactLogix, CompactLogix 5480, GuardLogix, Compact GuardLogix Loop with Unreachable Exit Condition ('Infinite Loop') Background Critical Infrastructure Sectors: Critical Manufacturing Countries/Areas Deployed: Worldwide Company Headquarters Location: United States Vulnerabilities Expand All + CVE-2021-42260 A potential denial of service vulnerability exists in the affected products and can be triggered via corrupt crafted data. This could result in a major nonrecoverable fault (MNRF). A program download is required to recover safety controllers. For non-safety controllers, a stage 2 reset is required to recover. View CVE Details Affected Products Rockwell Automation ControlLogix, CompactLogix, CompactLogix 5480, GuardLogix, Compact GuardLogix Vendor: Rockwell Automation Product Version: Rockwell Automation ControlLogix 5580 <34.015, Rockwell Automation ControlLogix 5580 <35.014, Rockwell Automation ControlLogix 5580 <36.013, Rockwell Automation ControlLogix 5580 <37.011, Rockwell Automation GuardLogix 5580 <34.015, Rockwell Automation GuardLogix 5580 <35.014, Rockwell Automation GuardLogix 5580 <36.013, Rockwell Automation GuardLogix 5580 <37.011, Rockwell Automation CompactLogix 5380 <34.015, Rockwell Automation CompactLogix 5380 <35.014, Rockwell Automation CompactLogix 5380 <36.013, Rockwell Automation CompactLogix 5380 <37.011, Rockwell Automation Compact GuardLogix 5380 <34.015, Rockwell Automation Compact GuardLogix 5380 <35.014, Rockwell Automation Compact GuardLogix 5380 <36.013, Rockwell Automation Compact GuardLogix 5380 <37.011, Rockwell Automation CompactLogix 5480 <34.015, Rockwell Automation CompactLogix 5480 <35.014, Rockwell Automation CompactLogix 5480 <36.013, Rockwell Automation CompactLogix 5480 <37.011 Product Status: known_affected Remediations Vendor fix Rockwell Automation recommends users update to firmware version 34.015 and later. Vendor fix Rockwell Automation recommends users update to firmware version 35.014 and later. Vendor fix Rockwell Automation recommends users update to firmware version 36.013 and later. Vendor fix Rockwell Automation recommends users update to firmware version 37.011 and later. 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-835 Loop with Unreachable Exit Condition ('Infinite Loop') 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 (versions <34.015, <35.014, <36.013, <37.011), GuardLogix 5580 (versions <34.015, <35.014, <36.013, <37.011), CompactLogix 5380 (versions <34.015, <35.014, <36.013, <37.011), Compact GuardLogix 5380 (versions <34.015, <35.014, <36.013, <37.011), and CompactLogix 5480 (versions <34.015, <35.014, <36.013, <37.011).

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 October 2023

Remediation

Users should update to firmware version 34.015 or later, 35.014 or later, 36.013 or later, or 37.011 or later. For those unable to upgrade, Rockwell Automation advises following their security best practices.

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.

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