CVE-2025-20142

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false, "operator": "OR"}], "operator": "AND"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability in the IPv4 access control list (ACL) feature and quality of service (QoS) policy feature of Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation Services Routers, ASR 9902 Compact High-Performance Routers, and ASR 9903 Compact High-Performance Routers could allow an unauthenticated, remote attacker to cause a line card to reset, resulting in a denial of service (DoS) condition.\r\n\r\nThis vulnerability is due to the incorrect handling of malformed IPv4 packets that are received on line cards where the interface has either an IPv4 ACL or QoS policy applied. An attacker could exploit this vulnerability by sending crafted IPv4 packets through an affected device. A successful exploit could allow the attacker to cause network processor errors, resulting in a reset or shutdown of the network process. Traffic over that line card would be lost while the line card reloads.\r\nNote: This vulnerability has predominantly been observed in Layer 2 VPN (L2VPN) environments where an IPv4 ACL or QoS policy has been applied to the bridge virtual interface. Layer 3 configurations where the interface has either an IPv4 ACL or QoS policy applied are also affected, though the vulnerability has not been observed."}, {"lang": "es", "value": "Una vulnerabilidad en la funci\u00f3n de lista de control de acceso (ACL) IPv4 y la pol\u00edtica de calidad de servicio (QoS) del software Cisco IOS XR para los routers de servicios de agregaci\u00f3n Cisco ASR serie 9000, los routers compactos de alto rendimiento ASR 9902 y ASR 9903 podr\u00eda permitir que un atacante remoto no autenticado reinicie una tarjeta de l\u00ednea, lo que resulta en una denegaci\u00f3n de servicio (DoS). Esta vulnerabilidad se debe a la gesti\u00f3n incorrecta de paquetes IPv4 malformados que se reciben en tarjetas de l\u00ednea cuya interfaz tiene aplicada una ACL IPv4 o una pol\u00edtica de QoS. Un atacante podr\u00eda explotar esta vulnerabilidad enviando paquetes IPv4 manipulados a trav\u00e9s de un dispositivo afectado. Una explotaci\u00f3n exitosa podr\u00eda permitir al atacante provocar errores en el procesador de red, lo que resultar\u00eda en el reinicio o apagado del proceso de red. El tr\u00e1fico a trav\u00e9s de esa tarjeta de l\u00ednea se perder\u00eda mientras esta se recarga. Nota: Esta vulnerabilidad se ha observado principalmente en entornos VPN de Capa 2 (L2VPN) donde se ha aplicado una ACL IPv4 o una pol\u00edtica de QoS a la interfaz virtual del puente. Las configuraciones de Capa 3 donde la interfaz tiene aplicada una ACL IPv4 o una pol\u00edtica de QoS tambi\u00e9n se ven afectadas, aunque no se ha observado la vulnerabilidad."}], "id": "CVE-2025-20142", "lastModified": "2026-06-17T08:40:46.090", "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": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-20142", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-03-21T20:34:14.309604Z", "version": "2.0.3"}}]}, "published": "2025-03-12T16:15:21.573", "references": [{"source": "psirt@cisco.com", "tags": ["Technical Description"], "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-ipv4uni-LfM3cfBu"}], "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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