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Rockwell Automation 1756-EN2, 1756-EN3, and 1756-ENBT

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Overview

Rockwell Automation has reported a vulnerability affecting their 1756-EN2, 1756-EN3, and 1756-ENBT communication modules. Specifically, versions 1756-EN3 and 1756-EN2 up to V12.001, and 1756-ENBT V6.006 are susceptible to a denial-of-service attack due to improper validation of connection packets. An attacker on the same network could exploit this issue by sending malicious packets that disrupt device connections, although these connections can recover immediately. This vulnerability is particularly concerning for industries relying on critical manufacturing infrastructure, as it could lead to significant operational disruptions. Users are advised to update their devices to version 12.002 to mitigate this risk.

Key Takeaways

  • Affected Systems: Rockwell Automation 1756-EN2 (<=V12.001), Rockwell Automation 1756-EN3 (<=V12.001), Rockwell Automation 1756-ENBT (V6.006)
  • Action Required: Update to version 12.
  • Timeline: Disclosed on 2026-07-16

Original Article Summary

View CSAF Summary Successful exploitation of this vulnerability could allow an attacker to cause a denial-of-service condition. The following versions of Rockwell Automation 1756-EN2, 1756-EN3, and 1756-ENBT are affected: 1756-EN3 <=V12.001 (CVE-2026-9653) 1756-EN2 <=V12.001 (CVE-2026-9653) 1756-ENBT V6.006 (CVE-2026-9653) CVSS Vendor Equipment Vulnerabilities v3 7.5 Rockwell Automation Rockwell Automation 1756-EN2, 1756-EN3, and 1756-ENBT Improper Validation of Integrity Check Value Background Critical Infrastructure Sectors: Critical Manufacturing Countries/Areas Deployed: Worldwide Company Headquarters Location: United States Vulnerabilities Expand All + CVE-2026-9653 A denial-of-service security issue exists across all the 1756-EN2, EN3, and ENBT communication module due to improper validation of CIP Implicit Connection packets. An attacker on the network can exploit this by sending crafted packets to continuously disrupt device connections, though device connections will recover immediately after. View CVE Details Affected Products Rockwell Automation 1756-EN2, 1756-EN3, and 1756-ENBT Vendor: Rockwell Automation Product Version: Rockwell Automation 1756-EN3: <=V12.001, Rockwell Automation 1756-EN2: <=V12.001, Rockwell Automation 1756-ENBT: V6.006 Product Status: known_affected Remediations Vendor fix Rockwell Automation recommends users take the following actions: 1756-EN3: Update to V12.002 Vendor fix 1756-EN2: Update to V12.002 Vendor fix 1756-ENBT: Product is discontinued, fix is unavailable 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 Acknowledgments Tyler Lentz of Idaho National Laboratory 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 this vulnerability. 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 this vulnerability has been reported to CISA at this time. Revision History Initial Release Date: 2026-07-16 Date Revision Summary 2026-07-16 1 Initial Publication Legal Notice and Terms of Use

Impact

Rockwell Automation 1756-EN2 (<=V12.001), Rockwell Automation 1756-EN3 (<=V12.001), Rockwell Automation 1756-ENBT (V6.006)

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 2026-07-16

Remediation

Update to version 12.002 for both 1756-EN2 and 1756-EN3. The 1756-ENBT product is discontinued, and no fix is available.

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, Exploit, and 3 more.

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