{"id":"CVE-2026-9636","state":"PUBLISHED","title":"Rockwell Automation CompactLogix® 5380 ControlLogix® 5580 / 1756-EN4 Communications Module – Certificate Revocation List Vulnerability","description":"A security issue exists within CompactLogix® 5380, ControlLogix® 5580, and EN4 communication modules related to CIP Security certificate revocation handling. The security issue stems from the controller failing to properly reject certificates signed by an intermediate certificate that has been revoked via a Certificate Revocation List (CRL). This could allow a network-based attacker to establish a connection using a certificate that should be untrusted, potentially bypassing CIP Security protections.","publishedAt":"2026-07-14T15:11:42.995Z","updatedAt":"2026-07-14T15:55:05.004Z","severity":{"score":8.2,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","source":"Rockwell"},"assigner":"Rockwell","products":["Rockwell Automation ControlLogix® 5580, CompactLogix® 5380, GuardLogix® 5580, Compact GuardLogix® 5380, 1756-EN4TR"],"affected":[{"vendor":"Rockwell Automation","product":"ControlLogix® 5580, CompactLogix® 5380, GuardLogix® 5580, Compact GuardLogix® 5380, 1756-EN4TR","defaultStatus":"unaffected","versions":[{"version":"Version 36 - Version 37","status":"affected"}]}],"references":["https://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1788.html"],"weaknesses":["CWE-299"],"ingestedAt":"2026-10-29T20:13:52.441Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/9xxx/CVE-2026-9636.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-9636","state":"PUBLISHED","datePublished":"2026-07-14T15:11:42.995Z","dateUpdated":"2026-07-14T15:55:05.004Z","assignerShortName":"Rockwell","assignerOrgId":"b73dd486-f505-4403-b634-40b078b177f0","dateReserved":"2026-05-26T18:10:55.329Z"},"containers":{"cna":{"title":"Rockwell Automation CompactLogix® 5380 ControlLogix® 5580 / 1756-EN4 Communications Module – Certificate Revocation List Vulnerability","descriptions":[{"lang":"en","value":"A security issue exists within CompactLogix® 5380, ControlLogix® 5580, and EN4 communication modules related to CIP Security certificate revocation handling. The security issue stems from the controller failing to properly reject certificates signed by an intermediate certificate that has been revoked via a Certificate Revocation List (CRL). This could allow a network-based attacker to establish a connection using a certificate that should be untrusted, potentially bypassing CIP Security protections."}],"affected":[{"vendor":"Rockwell Automation","product":"ControlLogix® 5580, CompactLogix® 5380, GuardLogix® 5580, Compact GuardLogix® 5380, 1756-EN4TR","defaultStatus":"unaffected","versions":[{"version":"Version 36 - Version 37","status":"affected"}]}],"references":[{"url":"https://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1788.html"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"HIGH","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","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":8.2,"vectorString":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-299","lang":"en","description":"CWE-299 Improper check for certificate revocation","type":"CWE"}]}],"providerMetadata":{"shortName":"Rockwell","orgId":"b73dd486-f505-4403-b634-40b078b177f0","dateUpdated":"2026-07-14T15:11:42.995Z"},"solutions":[{"lang":"en","value":"Upgrade to firmware version 38.011 or later.\n\nFor 1756-EN4TR upgrade to version 8.001 or later.","supportingMedia":[{"type":"text/html","base64":false,"value":"Upgrade to firmware version 38.011 or later.<br><br>For&nbsp;1756-EN4TR upgrade to version 8.001 or later."}]}],"source":{"advisory":"SD1788","discovery":"INTERNAL"},"x_generator":{"engine":"Vulnogram 1.0.2"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-14T15:54:57.625184Z","id":"CVE-2026-9636","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-14T15:55:05.004Z"}}]}}}