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BGP routing table, which could result in network instability. The vulnerability exists due to changes in the implementation of the BGP MPLS-Based Ethernet VPN RFC (RFC 7432) draft between IOS XE software releases. When the BGP Inclusive Multicast Ethernet Tag Route or BGP EVPN MAC/IP Advertisement Route update packet is received, it could be possible that the IP address length field is miscalculated. An attacker could exploit this vulnerability by sending a crafted BGP packet to an affected device after the BGP session was established. An exploit could allow the attacker to cause the affected device to reload or corrupt the BGP routing table; either outcome would result in a DoS. The vulnerability may be triggered when the router receives a crafted BGP message from a peer on an existing BGP session. This vulnerability affects all releases of Cisco IOS XE Software prior to software release 16.3 that support BGP EVPN configurations. If the device is not configured for EVPN, it is not vulnerable. Cisco Bug IDs: CSCui67191, CSCvg52875."}, {"lang": "es", "value": "Una vulnerabilidad en el protocolo BGP (Border Gateway Protocol) en una red Ethernet Virtual Private Network (EVPN) para Cisco IOS XE Software podr\u00eda permitir que un atacante remoto no autenticado haga que el dispositivo se reinicie, lo que da lugar a una denegaci\u00f3n de servicio (DoS) o, posiblemente, a que se corrompa la tabla de enrutamiento BGP, que a su vez puede dar como resultado la inestabilidad de la red. La vulnerabilidad existe debido a cambios en la implementaci\u00f3n de la versi\u00f3n de borrador de BGP MPLS-Based Ethernet VPN RFC (RFC 7432) entre distribuciones de software IOS XE. Cuando se reciben los paquetes de actualizaci\u00f3n BGP Inclusive Multicast Ethernet Tag Route or BGP EVPN MAC/IP Advertisement Route, es posible que el campo de longitud de direcci\u00f3n IP se calcule de manera incorrecta. Un atacante podr\u00eda explotar esta vulnerabilidad mediante el env\u00edo de un paquete BGP manipulado a un dispositivo afectado despu\u00e9s de que se establezca una sesi\u00f3n BGP. Un exploit podr\u00eda permitir que el atacante haga que se reinicie el dispositivo afectado o que corrompa la tabla de enrutamiento BGP. En cualquiera de los dos casos, el resultado ser\u00eda una denegaci\u00f3n de servicio (DoS). Esta vulnerabilidad puede tener lugar cuando el router recibe un mensaje BGP manipulado desde un peer o una sesi\u00f3n BGP existente. La vulnerabilidad afecta a todas las distribuciones de Cisco IOS XE Software anteriores a la versi\u00f3n 16.3 que soporta configuraciones BGP EVPN. Si el dispositivo no est\u00e1 configurado para EVPN, no es vulnerable. Cisco Bug IDs: CSCui67191, CSCvg52875."}], "id": "CVE-2017-12319", "lastModified": "2025-10-28T13:58:31.767", "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}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2018-03-27T09:29:00.280", "references": [{"source": "psirt@cisco.com", "tags": ["Broken Link", "Third Party Advisory", "VDB Entry"], "url": "http://www.securityfocus.com/bid/101676"}, {"source": "psirt@cisco.com", "tags": ["Vendor Advisory"], "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171103-bgp"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Broken Link", "Third Party Advisory", "VDB Entry"], "url": "http://www.securityfocus.com/bid/101676"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171103-bgp"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["US Government Resource"], "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-12319"}], "sourceIdentifier": "psirt@cisco.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-20"}], "source": "psirt@cisco.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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