{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-9653","assignerOrgId":"b73dd486-f505-4403-b634-40b078b177f0","state":"PUBLISHED","assignerShortName":"Rockwell","dateReserved":"2026-05-26T20:07:05.996Z","datePublished":"2026-07-14T15:00:06.196Z","dateUpdated":"2026-07-14T15:25:27.797Z"},"containers":{"cna":{"providerMetadata":{"orgId":"b73dd486-f505-4403-b634-40b078b177f0","shortName":"Rockwell","dateUpdated":"2026-07-14T15:00:06.196Z"},"title":"1756-EN2, 1756-EN3, and 1756-ENBT - Denial of Service via CIP Connection ID","problemTypes":[{"descriptions":[{"lang":"en","cweId":"CWE-354","description":"CWE-354 Improper validation of integrity check value","type":"CWE"}]}],"affected":[{"vendor":"Rockwell Automation","product":"1756-EN2, 1756-EN3","versions":[{"status":"affected","version":"12.001 and before"}],"defaultStatus":"unaffected"},{"vendor":"Rockwell Automation","product":"1756-ENBT","versions":[{"status":"affected","version":"6.006"}],"defaultStatus":"unaffected"}],"descriptions":[{"lang":"en","value":"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.","supportingMedia":[{"type":"text/html","base64":false,"value":"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.  "}]}],"references":[{"url":"https://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1780.html"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"HIGH","baseScore":8.7,"vectorString":"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"}}],"source":{"advisory":"SD1780","discovery":"EXTERNAL"},"x_generator":{"engine":"Vulnogram 1.0.2"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-14T15:25:20.423361Z","id":"CVE-2026-9653","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-07-14T15:25:27.797Z"}}]}}