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An attacker could exploit this vulnerability by sending a sequence of specific PPPoE packets from controlled customer premises equipment (CPE). A successful exploit could allow the attacker to cause the PPPoE process to continually restart, resulting in a denial of service condition (DoS).Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.This advisory is part of the September 2022 release of the Cisco IOS XR Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see ."}, {"lang": "es", "value": "Una vulnerabilidad en la funci\u00f3n Broadband Network Gateway PPP over Ethernet (PPPoE) del software Cisco IOS XR podr\u00eda permitir que un atacante adyacente no autenticado provoque que el proceso PPPoE se bloquee continuamente. Esta vulnerabilidad existe porque la funci\u00f3n PPPoE no maneja correctamente una condici\u00f3n de error dentro de una secuencia de paquetes espec\u00edfica manipulada. Un atacante podr\u00eda aprovechar esta vulnerabilidad enviando una secuencia de paquetes PPPoE espec\u00edficos desde un equipo local del cliente (CPE) controlado. Una explotaci\u00f3n exitosa podr\u00eda permitir que el atacante haga que el proceso PPPoE se reinicie continuamente, lo que da como resultado una condici\u00f3n de denegaci\u00f3n de servicio (DoS). Cisco ha publicado actualizaciones de software que solucionan esta vulnerabilidad. No existen workarounds que solucionen esta vulnerabilidad. Este aviso es parte de la publicaci\u00f3n de septiembre de 2022 del aviso de seguridad del software Cisco IOS XR. Para obtener una lista completa de los avisos y los enlaces a ellos, consulte."}], "id": "CVE-2022-20849", "lastModified": "2025-08-01T18:27:12.177", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.6, "impactScore": 4.0, "source": "psirt@cisco.com", "type": "Primary"}]}, "published": "2024-11-15T16:15:23.327", "references": [{"source": "psirt@cisco.com", "tags": ["Vendor Advisory"], "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-bng-Gmg5Gxt"}], "sourceIdentifier": "psirt@cisco.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-391"}], "source": "psirt@cisco.com", "type": "Primary"}]}

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