[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f77xdB8DWAoMYsQHKMv-a65aXVNIyPcXA6zFdF8or3L0":3},{"article":4,"iocs":42,"watch_terms":47,"solutions":48,"lesson":138},{"id":5,"title":6,"slug":7,"summary":8,"ai_summary":9,"brief":10,"url":11,"image_url":12,"published_at":13,"ingested_at":14,"relevance_score":15,"entities":16,"category_id":30,"category":31,"article_tags":34},"a992b78d-9e97-4ecd-b8bd-957c65401a23","Rockwell Automation 1756-EN2, 1756-EN3, and 1756-ENBT","rockwell-automation-1756-en2-1756-en3-and-1756-enbt-4d26f9","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 \u003C=V12.001 (CVE-2026-9653) 1756-EN2 \u003C=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\u002FAreas 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: \u003C=V12.001, Rockwell Automation 1756-EN2: \u003C=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\u002FAV:N\u002FAC:L\u002FPR:N\u002FUI:N\u002FS:U\u002FC:N\u002FI:N\u002FA:H 4.0 8.7 HIGH CVSS:4.0\u002FAV:N\u002FAC:L\u002FAT:N\u002FPR:N\u002FUI:N\u002FVC:N\u002FVI:N\u002FVA:H\u002FSC:N\u002FSI:N\u002FSA: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:\u002F\u002Fwww.cisa.gov\u002Fnotification) and this Privacy & Use policy (https:\u002F\u002Fwww.cisa.gov\u002Fprivacy-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\u002For 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\u002Fics. 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\u002Fics 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","CISA released an advisory for CVE-2026-9653 affecting Rockwell Automation 1756-EN2, 1756-EN3, and 1756-ENBT communication modules. The vulnerability stems from improper validation of CIP Implicit Connection packets, allowing network-based attackers to send crafted packets that cause denial-of-service by disrupting device connections (though connections recover immediately). Rockwell recommends updating EN2 and EN3 to V12.002, while the EN3BT is discontinued with no fix available.","CISA alerts Rockwell Automation 1756-EN2\u002FEN3\u002FENBT DoS vulnerability via CIP packet validation flaw.","https:\u002F\u002Fwww.cisa.gov\u002Fnews-events\u002Fics-advisories\u002Ficsa-26-197-02",null,"2026-07-16T12:00:00+00:00","2026-07-16T18:00:24.630758+00:00",8,[17,20,23,25,27],{"name":18,"type":19},"Rockwell Automation","vendor",{"name":21,"type":22},"1756-EN2","product",{"name":24,"type":22},"1756-EN3",{"name":26,"type":22},"1756-ENBT",{"name":28,"type":29},"CIP (Common Industrial Protocol)","technology","80544778-fabb-4dcd-aa35-17492e5dcf4f",{"id":30,"icon":12,"name":32,"slug":33},"Vulnerabilities","vulnerabilities",[35,37],{"category":36},{"id":30,"icon":12,"name":32,"slug":33},{"category":38},{"id":39,"icon":12,"name":40,"slug":41},"d6f63bb8-0801-486a-be7f-171400700454","IoT\u002FOT","iot-ot",[43],{"type":44,"value":45,"context":46},"cve","CVE-2026-9653","Denial-of-service vulnerability in Rockwell Automation 1756-EN2, 1756-EN3, 1756-ENBT due to improper CIP packet validation",[18,21,24],{"controls":49,"vendors":137},[50,79,108],{"slug":51,"name":52,"problem":53,"products":54},"patch-management","Automated patch management","Known holes get closed in days, not months.",[55,63,71],{"vendor_slug":56,"vendor_name":57,"vendor_logo":58,"product_slug":59,"product_name":60,"url":61,"description":62},"microsoft","Microsoft","\u002Fvendor-logos\u002Fmicrosoft.png","intune","Microsoft Intune","https:\u002F\u002Fwww.microsoft.com\u002Fen-us\u002Fsecurity\u002Fbusiness\u002Fmicrosoft-intune","Device management for Windows, macOS, iOS and Android, including update rings and compliance policies.",{"vendor_slug":64,"vendor_name":65,"vendor_logo":66,"product_slug":67,"product_name":68,"url":69,"description":70},"ivanti","Ivanti","\u002Fvendor-logos\u002Fivanti.png","neurons-patch-management","Ivanti Neurons for Patch Management","https:\u002F\u002Fwww.ivanti.com\u002Fproducts\u002Fivanti-neurons-for-patch-management","Risk-based patch management for operating systems and third-party applications.",{"vendor_slug":72,"vendor_name":73,"vendor_logo":74,"product_slug":75,"product_name":76,"url":77,"description":78},"manageengine","ManageEngine","\u002Fvendor-logos\u002Fmanageengine.png","patch-manager-plus","ManageEngine Patch Manager Plus","https:\u002F\u002Fwww.manageengine.com\u002Fpatch-management\u002F","Patch management for operating systems and third-party applications, on premises or in the cloud.",{"slug":80,"name":81,"problem":82,"products":83},"network-segmentation","Network segmentation and microsegmentation","One compromised machine can no longer reach everything else.",[84,92,100],{"vendor_slug":85,"vendor_name":86,"vendor_logo":87,"product_slug":88,"product_name":89,"url":90,"description":91},"threatlocker","ThreatLocker","\u002Fvendor-logos\u002Fthreatlocker.png","zero-trust-endpoint-firewall","Zero Trust Endpoint Firewall","https:\u002F\u002Fwww.threatlocker.com\u002Fcapabilities\u002Fzero-trust-endpoint-firewall","Centrally managed host firewall with device-level and dynamic access rules, to limit which machines can talk to each other.",{"vendor_slug":93,"vendor_name":94,"vendor_logo":95,"product_slug":96,"product_name":97,"url":98,"description":99},"akamai","Akamai","\u002Fvendor-logos\u002Fakamai.png","guardicore-segmentation","Akamai Guardicore Segmentation","https:\u002F\u002Fwww.akamai.com\u002Fproducts\u002Fakamai-guardicore-segmentation","Software-based microsegmentation with traffic visibility.",{"vendor_slug":101,"vendor_name":102,"vendor_logo":103,"product_slug":104,"product_name":105,"url":106,"description":107},"illumio","Illumio","\u002Fvendor-logos\u002Fillumio.png","illumio-segmentation","Illumio Segmentation","https:\u002F\u002Fwww.illumio.com\u002Fillumio-segmentation","Maps traffic between workloads and enforces segmentation across data centre, cloud and endpoints.",{"slug":109,"name":110,"problem":111,"products":112},"ot-security","OT and industrial control system security","Factory, building and utility control systems get visibility and protection.",[113,121,129],{"vendor_slug":114,"vendor_name":115,"vendor_logo":116,"product_slug":117,"product_name":118,"url":119,"description":120},"tenable","Tenable","\u002Fvendor-logos\u002Ftenable.png","tenable-ot-security","Tenable OT Security","https:\u002F\u002Fwww.tenable.com\u002Fproducts\u002Fot-security","Asset inventory, vulnerability and threat detection for industrial networks.",{"vendor_slug":122,"vendor_name":123,"vendor_logo":124,"product_slug":125,"product_name":126,"url":127,"description":128},"claroty","Claroty","\u002Fvendor-logos\u002Fclaroty.png","xdome","Claroty xDome","https:\u002F\u002Fclaroty.com\u002Findustrial-cybersecurity\u002Fxdome","Asset inventory, vulnerability management and threat detection for industrial networks.",{"vendor_slug":130,"vendor_name":131,"vendor_logo":132,"product_slug":133,"product_name":134,"url":135,"description":136},"nozomi-networks","Nozomi Networks","\u002Fvendor-logos\u002Fnozomi-networks.png","guardian","Nozomi Networks Guardian","https:\u002F\u002Fwww.nozominetworks.com\u002Fplatform\u002Fguardian","Passive monitoring, asset inventory and threat detection for OT and IoT networks.",[],{"slug":139,"title":140,"body":141,"framework_refs":142,"framework_notes":152},"rockwell-automation-ics-modules-vulnerable-to-dos-via-malformed-cip-packets","Rockwell Automation ICS Modules Vulnerable to DoS via Malformed CIP Packets","CVE-2026-9653 exposes Rockwell Automation 1756-EN2, EN3, and ENBT communication modules to denial-of-service attacks due to improper validation of CIP Implicit Connection packets, allowing any network-reachable attacker to disrupt device communications. This is particularly critical in industrial control system (ICS) environments where even brief disruptions can halt production lines or compromise safety systems. The discontinued EN3BT module has no available patch, leaving operators permanently exposed unless they replace the hardware entirely. This highlights the compounded risk of running end-of-life ICS components in operational technology (OT) environments where upgrades are often deferred.",[143,144,145,146,147,148,149,150,151],"CIS Control 2 – Inventory and Control of Software\u002FHardware Assets","CIS Control 7 – Continuous Vulnerability Management","CIS Control 12 – Network Infrastructure Management","NIST SP 800-82 Rev. 3 – Guide to OT Security","NIST CSF ID.AM-1 – Physical devices and systems are inventoried","NIST CSF PR.IP-12 – Vulnerability management plan is developed and implemented","NIST SI-2 – Flaw Remediation","IEC 62443-2-4 – Security program requirements for IACS service providers","CISA ICS Advisory ICSA-series – Industrial Control Systems Advisories",{}]