{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-11-03T12:11:36.075","vulnerabilities":[{"cve":{"id":"CVE-2021-27876","sourceIdentifier":"cve@mitre.org","published":"2021-03-01T22:15:14.350","lastModified":"2026-06-17T03:45:32.780","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"An issue was discovered in Veritas Backup Exec before 21.2. The communication between a client and an Agent requires successful authentication, which is typically completed over a secure TLS communication. However, due to a vulnerability in the SHA Authentication scheme, an attacker is able to gain unauthorized access and complete the authentication process. Subsequently, the client can execute data management protocol commands on the authenticated connection. By using crafted input parameters in one of these commands, an attacker can access an arbitrary file on the system using System privileges."},{"lang":"es","value":"Se detectó un problema en Veritas Backup Exec versiones anteriores a 21.2. La comunicación entre un cliente y un agente requiere una autenticación con éxito, que generalmente se completa por medio de una comunicación TLS segura. Sin embargo, debido a una vulnerabilidad en el esquema de autenticación SHA, un atacante puede conseguir acceso no autorizado y completar el proceso de autenticación. Posteriormente, el cliente puede ejecutar comandos de protocolo de gestión de datos en la conexión autenticada. Mediante el uso de parámetros de entrada diseñados en uno de estos comandos, un atacante puede acceder a un archivo arbitrario en el sistema utilizando privilegios system"}],"affected":[{"source":"cve@mitre.org","affectedData":[{"vendor":"n/a","product":"n/a","versions":[{"version":"n/a","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"cve@mitre.org","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","baseScore":8.1,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"NONE"},"exploitabilityScore":2.8,"impactScore":5.2},{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","baseScore":8.1,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"NONE"},"exploitabilityScore":2.8,"impactScore":5.2}],"cvssMetricV2":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"2.0","vectorString":"AV:N/AC:L/Au:S/C:C/I:P/A:N","baseScore":7.5,"accessVector":"NETWORK","accessComplexity":"LOW","authentication":"SINGLE","confidentialityImpact":"COMPLETE","integrityImpact":"PARTIAL","availabilityImpact":"NONE"},"baseSeverity":"HIGH","exploitabilityScore":8.0,"impactScore":7.8,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2023-12-22T05:01:02.404828Z","id":"CVE-2021-27876","options":[{"exploitation":"active"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"cisaExploitAdd":"2023-04-07","cisaActionDue":"2023-04-28","cisaRequiredAction":"Apply updates per vendor instructions.","cisaVulnerabilityName":"Veritas Backup Exec Agent File Access Vulnerability","weaknesses":[{"source":"nvd@nist.gov","type":"Primary","description":[{"lang":"en","value":"NVD-CWE-noinfo"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:veritas:backup_exec:*:*:*:*:*:*:*:*","versionEndExcluding":"21.2","matchCriteriaId":"2E6F2EEE-7E5A-4EA1-87F2-97C26EAE8FCC"}]}]}],"references":[{"url":"http://packetstormsecurity.com/files/168506/Veritas-Backup-Exec-Agent-Remote-Code-Execution.html","source":"cve@mitre.org","tags":["Exploit","Third Party Advisory","VDB Entry"]},{"url":"https://www.veritas.com/content/support/en_US/security/VTS21-001#issue2","source":"cve@mitre.org","tags":["Vendor Advisory"]},{"url":"http://packetstormsecurity.com/files/168506/Veritas-Backup-Exec-Agent-Remote-Code-Execution.html","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Exploit","Third Party Advisory","VDB Entry"]},{"url":"https://www.veritas.com/content/support/en_US/security/VTS21-001#issue2","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-27876","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","tags":["US Government Resource"]}]}}]}