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An attacker could exploit this vulnerability by sending a crafted BGP update message, or the network could be designed in such a manner that the AS_CONFED_SEQUENCE attribute grows to 255 AS numbers or more. A successful exploit could allow the attacker to cause memory corruption, which may cause the BGP process to restart, resulting in a DoS condition. To exploit this vulnerability, an attacker must control a BGP confederation speaker within the same autonomous system as the victim, or the network must be designed in such a manner that the AS_CONFED_SEQUENCE attribute grows to 255 AS numbers or more."}, {"lang": "es", "value": "Una vulnerabilidad en la implementaci\u00f3n de la confederaci\u00f3n del Protocolo de Puerta de Enlace Fronteriza (BGP) en el software Cisco IOS XR podr\u00eda permitir que un atacante remoto no autenticado provoque una denegaci\u00f3n de servicio (DoS). Esta vulnerabilidad se debe a una corrupci\u00f3n de memoria que ocurre al crear una actualizaci\u00f3n de BGP con un atributo AS_CONFED_SEQUENCE que contiene 255 n\u00fameros de sistema aut\u00f3nomo (AS). Un atacante podr\u00eda explotar esta vulnerabilidad enviando un mensaje de actualizaci\u00f3n de BGP manipulado, o la red podr\u00eda estar dise\u00f1ada para que el atributo AS_CONFED_SEQUENCE alcance 255 n\u00fameros de AS o m\u00e1s. Una explotaci\u00f3n exitosa podr\u00eda permitir al atacante causar corrupci\u00f3n de memoria, lo que podr\u00eda provocar el reinicio del proceso BGP y provocar una denegaci\u00f3n de servicio (DoS). Para explotar esta vulnerabilidad, un atacante debe controlar un interlocutor de la confederaci\u00f3n BGP dentro del mismo sistema aut\u00f3nomo que la v\u00edctima, o la red debe estar dise\u00f1ada para que el atributo AS_CONFED_SEQUENCE alcance 255 n\u00fameros de AS o m\u00e1s."}], "id": "CVE-2025-20115", "lastModified": "2025-08-01T16:13:48.990", "metrics": {"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": "psirt@cisco.com", "type": "Primary"}]}, "published": "2025-03-12T16:15:21.090", "references": [{"source": "psirt@cisco.com", "tags": ["Third Party Advisory"], "url": "https://blog.apnic.net/2024/09/02/crafting-endless-as-paths-in-bgp/"}, {"source": "psirt@cisco.com", "tags": ["Vendor Advisory"], "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-bgp-dos-O7stePhX"}], "sourceIdentifier": "psirt@cisco.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-120"}], "source": "psirt@cisco.com", "type": "Primary"}]}

{}