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"D686F339-9406-4ADF-B124-C815D43E4CAA", "vulnerable": false}, {"criteria": "cpe:2.3:h:cisco:ncs_560:-:*:*:*:*:*:*:*", "matchCriteriaId": "D4CC8256-E4F8-4DCB-B69A-40A7C5AA41E8", "vulnerable": false}, {"criteria": "cpe:2.3:h:cisco:ncs_6000:-:*:*:*:*:*:*:*", "matchCriteriaId": "523058BF-DE14-4FAD-8A67-C8CA795032D9", "vulnerable": false}], "negate": false, "operator": "OR"}], "operator": "AND"}], "descriptions": [{"lang": "en", "value": "Multiple vulnerabilities in the implementation of Border Gateway Protocol (BGP) Ethernet VPN (EVPN) functionality in Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerabilities are due to incorrect processing of BGP update messages that contain crafted EVPN attributes. An attacker could exploit these vulnerabilities by sending BGP EVPN update messages with malformed attributes to be processed by an affected system. A successful exploit could allow the attacker to cause the BGP process to restart unexpectedly, resulting in a DoS condition. The Cisco implementation of BGP accepts incoming BGP traffic only from explicitly defined peers. To exploit these vulnerabilities, the malicious BGP update message would need to come from a configured, valid BGP peer, or would need to be injected by the attacker into the victim's BGP network on an existing, valid TCP connection to a BGP peer."}, {"lang": "es", "value": "M\u00faltiples vulnerabilidades en la implementaci\u00f3n de la funcionalidad de Border Gateway Protocol (BGP) Ethernet VPN (EVPN) en Cisco IOS XR Software, podr\u00edan permitir a un atacante remoto no autenticado causar una condici\u00f3n de denegaci\u00f3n de servicio (DoS). Las vulnerabilidades son debido al procesamiento incorrecto de los mensajes de actualizaci\u00f3n de BGP que contienen atributos EVPN dise\u00f1ados. Un atacante podr\u00eda explotar estas vulnerabilidades mediante el env\u00edo de mensajes de actualizaci\u00f3n de BGP EVPN con atributos malformados para que sean procesados por un sistema afectado. Una explotaci\u00f3n con \u00e9xito podr\u00eda permitir a un atacante causar que el proceso BGP se reinicie inesperadamente, resultando en una condici\u00f3n DoS. La implementaci\u00f3n de Cisco de BGP acepta tr\u00e1fico BGP entrante solo de peers definidos expl\u00edcitamente. Para explotar estas vulnerabilidades, el mensaje de actualizaci\u00f3n de BGP malicioso necesitar\u00eda provenir de un peer BGP v\u00e1lido configurado, o necesitar\u00eda ser inyectado por el atacante en la red BGP de la v\u00edctima en una conexi\u00f3n TCP v\u00e1lida existente a un peer BGP"}], "id": "CVE-2019-16021", "lastModified": "2024-11-21T04:29:56.580", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 5.0, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 2.9, "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": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2020-09-23T01:15:13.940", "references": [{"source": "ykramarz@cisco.com", "tags": ["Vendor Advisory"], "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200122-ios-xr-evpn"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200122-ios-xr-evpn"}], "sourceIdentifier": "ykramarz@cisco.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-399"}], "source": "ykramarz@cisco.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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