{"containers":{"cna":{"affected":[{"product":"Rockwell Automation MicroLogix 1400","vendor":"n/a","versions":[{"status":"affected","version":"MicroLogix 1400, All series Version 21.6 and below"}]}],"descriptions":[{"lang":"en","value":"Rockwell Automation MicroLogix 1400 Version 21.6 and below may allow a remote unauthenticated attacker to send a specially crafted Modbus packet allowing the attacker to retrieve or modify random values in the register. If successfully exploited, this may lead to a buffer overflow resulting in a denial-of-service condition. The FAULT LED will flash RED and communications may be lost. Recovery from denial-of-service condition requires the fault to be cleared by the user."}],"problemTypes":[{"descriptions":[{"cweId":"CWE-120","description":"CLASSIC BUFFER OVERFLOW CWE-120","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2021-03-25T15:59:07.000Z","orgId":"7d14cffa-0d7d-4270-9dc0-52cabd5a23a6","shortName":"icscert"},"references":[{"tags":["x_refsource_MISC"],"url":"https://us-cert.cisa.gov/ics/advisories/icsa-21-033-01"},{"tags":["x_refsource_MISC"],"url":"https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1129877/loc/en_US#__highlight"}],"x_legacyV4Record":{"CVE_data_meta":{"ASSIGNER":"ics-cert@hq.dhs.gov","ID":"CVE-2021-22659","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"Rockwell Automation MicroLogix 1400","version":{"version_data":[{"version_value":"MicroLogix 1400, All series Version 21.6 and below"}]}}]},"vendor_name":"n/a"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"Rockwell Automation MicroLogix 1400 Version 21.6 and below may allow a remote unauthenticated attacker to send a specially crafted Modbus packet allowing the attacker to retrieve or modify random values in the register. If successfully exploited, this may lead to a buffer overflow resulting in a denial-of-service condition. The FAULT LED will flash RED and communications may be lost. Recovery from denial-of-service condition requires the fault to be cleared by the user."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CLASSIC BUFFER OVERFLOW CWE-120"}]}]},"references":{"reference_data":[{"name":"https://us-cert.cisa.gov/ics/advisories/icsa-21-033-01","refsource":"MISC","url":"https://us-cert.cisa.gov/ics/advisories/icsa-21-033-01"},{"name":"https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1129877/loc/en_US#__highlight","refsource":"MISC","url":"https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1129877/loc/en_US#__highlight"}]}}},"adp":[{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-03T18:51:07.020Z"},"title":"CVE Program Container","references":[{"tags":["x_refsource_MISC","x_transferred"],"url":"https://us-cert.cisa.gov/ics/advisories/icsa-21-033-01"},{"tags":["x_refsource_MISC","x_transferred"],"url":"https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1129877/loc/en_US#__highlight"}]},{"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":"2026-06-03T13:09:27.807640Z","id":"CVE-2021-22659","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":"2026-06-03T13:10:07.459Z"}}]},"cveMetadata":{"assignerOrgId":"7d14cffa-0d7d-4270-9dc0-52cabd5a23a6","assignerShortName":"icscert","cveId":"CVE-2021-22659","datePublished":"2021-03-25T15:59:07.000Z","dateReserved":"2021-01-05T00:00:00.000Z","dateUpdated":"2026-06-03T13:10:07.459Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"}