{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-05-06T09:18:02.656","vulnerabilities":[{"cve":{"id":"CVE-2021-22659","sourceIdentifier":"ics-cert@hq.dhs.gov","published":"2021-03-25T16:15:14.040","lastModified":"2024-11-21T05:50:25.370","vulnStatus":"Modified","cveTags":[],"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."},{"lang":"es","value":"Rockwell Automation MicroLogix 1400 versión 21.6 y anteriores, puede permitir a un atacante remoto no autenticado enviar un paquete Modbus especialmente diseñado que le permita al atacante recuperar o modificar valores aleatorios en el registro. Si es explotado con éxito, esto puede conllevar a un desbordamiento del búfer que resulte en una condición de denegación de servicio. El LED de FALLO parpadeará en ROJO y es posible que se pierdan las comunicaciones. Una recuperación de la condición de denegación de servicio requiere que el fallo sea eliminado por usuario"}],"metrics":{"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H","baseScore":8.6,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":4.7}],"cvssMetricV2":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"2.0","vectorString":"AV:N/AC:L/Au:N/C:P/I:P/A:P","baseScore":7.5,"accessVector":"NETWORK","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"PARTIAL","integrityImpact":"PARTIAL","availabilityImpact":"PARTIAL"},"baseSeverity":"HIGH","exploitabilityScore":10.0,"impactScore":6.4,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}]},"weaknesses":[{"source":"ics-cert@hq.dhs.gov","type":"Secondary","description":[{"lang":"en","value":"CWE-120"}]}],"configurations":[{"operator":"AND","nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:rockwellautomation:micrologix_1400_firmware:*:*:*:*:*:*:*:*","versionEndIncluding":"21.6","matchCriteriaId":"325F851D-26F6-4361-95A8-1CB68746B5E3"}]},{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":false,"criteria":"cpe:2.3:h:rockwellautomation:micrologix_1400:-:*:*:*:*:*:*:*","matchCriteriaId":"196EA0BE-FDF3-46BE-B3DA-5F49208C5D80"}]}]}],"references":[{"url":"https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1129877/loc/en_US#__highlight","source":"ics-cert@hq.dhs.gov","tags":["Permissions Required","Vendor Advisory"]},{"url":"https://us-cert.cisa.gov/ics/advisories/icsa-21-033-01","source":"ics-cert@hq.dhs.gov","tags":["Third Party Advisory","US Government Resource"]},{"url":"https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1129877/loc/en_US#__highlight","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Permissions Required","Vendor Advisory"]},{"url":"https://us-cert.cisa.gov/ics/advisories/icsa-21-033-01","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Third Party Advisory","US Government Resource"]}]}}]}