{"id":"CVE-2021-33012","state":"PUBLISHED","title":"Rockwell Automation MicroLogix 1100, all versions, allows a remote, unauthenticated attacker sending specially crafted commands to cause the PLC to fault when the controller is swi","description":"Rockwell Automation MicroLogix 1100, all versions, allows a remote, unauthenticated attacker sending specially crafted commands to cause the PLC to fault when the controller is switched to RUN mode, which results in a denial-of-service condition. If successfully exploited, this vulnerability will cause the controller to fault whenever the controller is switched to RUN mode.","publishedAt":"2021-07-09T14:03:55.000Z","updatedAt":"2026-06-03T13:18:00.338Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"CISA-ADP"},"assigner":"icscert","products":["n/a Rockwell Automation MicroLogix 1100"],"affected":[{"vendor":"n/a","product":"Rockwell Automation MicroLogix 1100","versions":[{"version":"All Versions","status":"affected"}]}],"references":["https://us-cert.cisa.gov/ics/advisories/icsa-21-189-01"],"weaknesses":["CWE-20"],"ingestedAt":"2026-10-29T19:48:36.050Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/33xxx/CVE-2021-33012.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-33012","state":"PUBLISHED","datePublished":"2021-07-09T14:03:55.000Z","dateUpdated":"2026-06-03T13:18:00.338Z","assignerShortName":"icscert","assignerOrgId":"7d14cffa-0d7d-4270-9dc0-52cabd5a23a6","dateReserved":"2021-05-13T00:00:00.000Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"Rockwell Automation MicroLogix 1100, all versions, allows a remote, unauthenticated attacker sending specially crafted commands to cause the PLC to fault when the controller is switched to RUN mode, which results in a denial-of-service condition. If successfully exploited, this vulnerability will cause the controller to fault whenever the controller is switched to RUN mode."}],"affected":[{"vendor":"n/a","product":"Rockwell Automation MicroLogix 1100","versions":[{"version":"All Versions","status":"affected"}]}],"references":[{"url":"https://us-cert.cisa.gov/ics/advisories/icsa-21-189-01","tags":["x_refsource_MISC"]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-20","description":"IMPROPER INPUT VALIDATION CWE-20","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"icscert","dateUpdated":"2021-07-09T14:03:55.000Z","orgId":"7d14cffa-0d7d-4270-9dc0-52cabd5a23a6"},"x_legacyV4Record":{"CVE_data_meta":{"ASSIGNER":"ics-cert@hq.dhs.gov","ID":"CVE-2021-33012","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"Rockwell Automation MicroLogix 1100","version":{"version_data":[{"version_value":"All Versions"}]}}]},"vendor_name":"n/a"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"Rockwell Automation MicroLogix 1100, all versions, allows a remote, unauthenticated attacker sending specially crafted commands to cause the PLC to fault when the controller is switched to RUN mode, which results in a denial-of-service condition. If successfully exploited, this vulnerability will cause the controller to fault whenever the controller is switched to RUN mode."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"IMPROPER INPUT VALIDATION CWE-20"}]}]},"references":{"reference_data":[{"name":"https://us-cert.cisa.gov/ics/advisories/icsa-21-189-01","refsource":"MISC","url":"https://us-cert.cisa.gov/ics/advisories/icsa-21-189-01"}]}}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://us-cert.cisa.gov/ics/advisories/icsa-21-189-01","tags":["x_refsource_MISC","x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-03T23:42:19.616Z"}},{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7.5,"attackVector":"NETWORK","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"NONE","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-06-03T13:17:35.412176Z","id":"CVE-2021-33012","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-06-03T13:18:00.338Z"}}]}}}