CVE-2021-1376

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These vulnerabilities are due to improper checks performed by system boot routines. To exploit these vulnerabilities, the attacker would need privileged access to the CLI of the device. A successful exploit could allow the attacker to either execute arbitrary code on the underlying operating system or execute unsigned code and bypass the image verification check part of the secure boot process. For more information about these vulnerabilities, see the Details section of this advisory."}, {"lang": "es", "value": "M\u00faltiples vulnerabilidades en la funcionalidad fast reload del Software Cisco IOS XE que se ejecuta en los Switches Cisco Catalyst 3850, Cisco Catalyst 9300 y Cisco Catalyst 9300L Series, podr\u00edan permitir a un atacante local autenticado ejecutar c\u00f3digo arbitrario en el sistema operativo subyacente, instalar y arrancar un imagen de software malicioso o ejecutar binarios sin firmar en un dispositivo afectado. Estas vulnerabilidades son debido a comprobaciones incorrectas llevadas a cabo por las rutinas de arranque del sistema. Para explotar estas vulnerabilidades, el atacante necesitar\u00eda acceso privilegiado a la CLI del dispositivo. Una explotaci\u00f3n con \u00e9xito podr\u00eda permitir al atacante ejecutar c\u00f3digo arbitrario en el sistema operativo subyacente o ejecutar c\u00f3digo sin firmar y omitir la parte de comprobaci\u00f3n de imagen del proceso de arranque seguro. Para mayor informaci\u00f3n sobre estas vulnerabilidades, consulte la secci\u00f3n Detalles de este aviso"}], "id": "CVE-2021-1376", "lastModified": "2026-06-17T03:31:37.787", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "HIGH", "cvssData": {"accessComplexity": "LOW", "accessVector": "LOCAL", "authentication": "NONE", "availabilityImpact": "COMPLETE", "baseScore": 7.2, "confidentialityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C", "version": "2.0"}, "exploitabilityScore": 3.9, "impactScore": 10.0, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV30": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 6.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "version": "3.0"}, "exploitabilityScore": 0.8, "impactScore": 5.9, "source": "psirt@cisco.com", "type": "Secondary"}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 6.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 0.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-1376", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2024-11-08T20:19:38.354716Z", "version": "2.0.3"}}]}, "published": "2021-03-24T21:15:12.177", "references": [{"source": "psirt@cisco.com", "tags": ["Vendor Advisory"], "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fast-Zqr6DD5"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fast-Zqr6DD5"}], "sourceIdentifier": "psirt@cisco.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-347"}], "source": "psirt@cisco.com", "type": "Secondary"}]}

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