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The vulnerability is due to incomplete input validation of a specific type of BGP MVPN update message. An attacker could exploit this vulnerability by sending this specific, valid BGP MVPN update message to a targeted device. A successful exploit could allow the attacker to cause one of the BGP-related routing applications to restart multiple times, leading to a system-level restart. Note: The Cisco implementation of BGP accepts incoming BGP traffic from only explicitly configured peers. To exploit this vulnerability, an attacker must send a specific BGP MVPN update message over an established TCP connection that appears to come from a trusted BGP peer. To do so, the attacker must obtain information about the BGP peers in the trusted network of the affected system."}, {"lang": "es", "value": "Una vulnerabilidad en la implementaci\u00f3n de Border Gateway Protocol (BGP) Multicast VPN (MVPN) de Cisco NX-OS Software, podr\u00eda permitir a un atacante remoto no autenticado causar que un dispositivo afectado se recargue inesperadamente, resultando en una condici\u00f3n de denegaci\u00f3n de servicio (DoS). La vulnerabilidad es debido a una comprobaci\u00f3n incompleta de entrada de un tipo espec\u00edfico de mensaje de actualizaci\u00f3n de BGP MVPN. Un atacante podr\u00eda explotar esta vulnerabilidad mediante el env\u00edo de este mensaje de actualizaci\u00f3n de BGP MVPN espec\u00edfico y v\u00e1lido hacia un dispositivo objetivo. Una explotaci\u00f3n con \u00e9xito podr\u00eda permitir al atacante causar que una de las aplicaciones de enrutamiento relacionadas con BGP se reinicie varias veces, conllevando a un reinicio a nivel del sistema. Nota: La implementaci\u00f3n de Cisco de BGP acepta tr\u00e1fico BGP entrante solo de peers configurados expl\u00edcitamente. Para explotar esta vulnerabilidad, un atacante debe enviar un mensaje de actualizaci\u00f3n de BGP MVPN espec\u00edfico por medio de una conexi\u00f3n TCP establecida que parece provenir de un peer BGP confiable. Para hacerlo, el atacante debe obtener informaci\u00f3n sobre los peers BGP en la red confiable del sistema afectado"}], "id": "CVE-2020-3397", "lastModified": "2021-08-06T18:58:16.553", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "HIGH", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "COMPLETE", "baseScore": 7.1, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:C", "version": "2.0"}, "exploitabilityScore": 8.6, "impactScore": 6.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV30": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.6, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H", "version": "3.0"}, "exploitabilityScore": 3.9, "impactScore": 4.0, "source": "ykramarz@cisco.com", "type": "Secondary"}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.6, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 4.0, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2020-08-27T16:15:12.143", "references": [{"source": "ykramarz@cisco.com", "tags": ["Vendor Advisory"], "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxosbgp-nlri-dos-458rG2OQ"}], "sourceIdentifier": "ykramarz@cisco.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-20"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-20"}], "source": "ykramarz@cisco.com", "type": "Secondary"}]}

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