CVE-2025-20212

{"id": "CVE-2025-20212", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "psirt@cisco.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 7.7, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 4.0, "exploitabilityScore": 3.1}]}, "published": "2025-04-02T17:15:44.323", "references": [{"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-meraki-mx-vpn-dos-vNRpDvfb", "source": "psirt@cisco.com"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Primary", "source": "psirt@cisco.com", "description": [{"lang": "en", "value": "CWE-457"}]}], "descriptions": [{"lang": "en", "value": "A vulnerability in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series devices could allow an authenticated, remote attacker to cause a denial of service (DoS) condition in the Cisco AnyConnect service on an affected device. To exploit this vulnerability, the attacker must have valid VPN user credentials on the affected device.\r\n\r This vulnerability exists because a variable is not initialized when an SSL VPN session is established. An attacker could exploit this vulnerability by supplying crafted attributes while establishing an SSL VPN session with an affected device. A successful exploit could allow the attacker to cause the Cisco AnyConnect VPN server to restart, resulting in the failure of the established SSL VPN sessions and forcing remote users to initiate a new VPN connection and reauthenticate. A sustained attack could prevent new SSL VPN connections from being established.\r\n\r Note: When the attack traffic stops, the Cisco AnyConnect VPN server recovers without manual intervention."}, {"lang": "es", "value": "Una vulnerabilidad en el servidor VPN Cisco AnyConnect de los dispositivos Cisco Meraki MX y Cisco Meraki Z Series podr\u00eda permitir que un atacante remoto autenticado provoque una denegaci\u00f3n de servicio (DoS) en el servicio Cisco AnyConnect de un dispositivo afectado. Para explotar esta vulnerabilidad, el atacante debe tener credenciales de usuario VPN v\u00e1lidas en el dispositivo afectado. Esta vulnerabilidad existe porque una variable no se inicializa al establecer una sesi\u00f3n VPN SSL. Un atacante podr\u00eda aprovechar esta vulnerabilidad proporcionando atributos manipulados al establecer una sesi\u00f3n VPN SSL con un dispositivo afectado. Una explotaci\u00f3n exitosa podr\u00eda permitir al atacante reiniciar el servidor VPN Cisco AnyConnect, lo que provocar\u00eda el fallo de las sesiones VPN SSL establecidas y obligar\u00eda a los usuarios remotos a iniciar una nueva conexi\u00f3n VPN y a autenticarse de nuevo. Un ataque continuo podr\u00eda impedir el establecimiento de nuevas conexiones VPN SSL. Nota: Cuando el tr\u00e1fico del ataque se detiene, el servidor VPN Cisco AnyConnect se recupera sin intervenci\u00f3n manual."}], "lastModified": "2025-04-07T14:18:49.830", "sourceIdentifier": "psirt@cisco.com"}