{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-04-29T11:36:25.727","vulnerabilities":[{"cve":{"id":"CVE-2024-20406","sourceIdentifier":"psirt@cisco.com","published":"2024-09-11T17:15:13.040","lastModified":"2024-10-07T17:56:43.103","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"A vulnerability in the segment routing feature for the Intermediate System-to-Intermediate System (IS-IS) protocol of Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device.\r\n\r\nThis vulnerability is due to insufficient input validation of ingress IS-IS packets. An attacker could exploit this vulnerability by sending specific IS-IS packets to an affected device after forming an adjacency. A successful exploit could allow the attacker to cause the IS-IS process on all affected devices that are participating in the Flexible Algorithm to crash and restart, resulting in a DoS condition.\r\nNote: The IS-IS protocol is a routing protocol. To exploit this vulnerability, an attacker must be Layer 2-adjacent to the affected device and must have formed an adjacency. This vulnerability affects segment routing for IS-IS over IPv4 and IPv6 control planes as well as devices that are configured as level 1, level 2, or multi-level routing IS-IS type."},{"lang":"es","value":"Una vulnerabilidad en la función de enrutamiento de segmentos para el protocolo de sistema intermedio a sistema intermedio (IS-IS) del software Cisco IOS XR podría permitir que un atacante adyacente no autenticado provoque una condición de denegación de servicio (DoS) en un dispositivo afectado. Esta vulnerabilidad se debe a una validación de entrada insuficiente de los paquetes IS-IS de entrada. Un atacante podría aprovechar esta vulnerabilidad enviando paquetes IS-IS específicos a un dispositivo afectado después de formar una adyacencia. Una explotación exitosa podría permitir que el atacante provoque que el proceso IS-IS en todos los dispositivos afectados que participan en el algoritmo flexible se bloquee y se reinicie, lo que da como resultado una condición de DoS. Nota: El protocolo IS-IS es un protocolo de enrutamiento. Para aprovechar esta vulnerabilidad, un atacante debe estar adyacente a la capa 2 del dispositivo afectado y debe haber formado una adyacencia. Esta vulnerabilidad afecta al enrutamiento de segmentos para IS-IS sobre planos de control IPv4 e IPv6, así como a dispositivos que están configurados como tipo IS-IS de enrutamiento de nivel 1, nivel 2 o multinivel."}],"metrics":{"cvssMetricV31":[{"source":"psirt@cisco.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","baseScore":7.4,"baseSeverity":"HIGH","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":4.0},{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","baseScore":7.4,"baseSeverity":"HIGH","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":4.0}]},"weaknesses":[{"source":"psirt@cisco.com","type":"Secondary","description":[{"lang":"en","value":"CWE-20"}]},{"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:o:cisco:ios_xr:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8.1","versionEndExcluding":"7.0.0","matchCriteriaId":"A21D4B88-10AE-4726-9D00-48CF36068409"},{"vulnerable":true,"criteria":"cpe:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:*","versionStartIncluding":"7.4.1","versionEndExcluding":"7.11.2","matchCriteriaId":"6BB02B4B-AC47-4DFF-BB0F-AD0F2D12866B"}]}]}],"references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-isis-xehpbVNe","source":"psirt@cisco.com","tags":["Vendor Advisory"]}]}}]}