CVE-2025-20136

{"id": "CVE-2025-20136", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "psirt@cisco.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 8.6, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 4.0, "exploitabilityScore": 3.9}]}, "published": "2025-08-14T17:15:35.063", "references": [{"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-nat-dns-dos-bqhynHTM", "source": "psirt@cisco.com"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "psirt@cisco.com", "description": [{"lang": "en", "value": "CWE-835"}]}], "descriptions": [{"lang": "en", "value": "A vulnerability in the function that performs IPv4 and IPv6 Network Address Translation (NAT) DNS inspection for Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. \r\n\r\nThis vulnerability is due to an infinite loop condition that occurs when a Cisco Secure ASA or Cisco Secure FTD device processes DNS packets with DNS inspection enabled and the device is configured for NAT44, NAT64, or NAT46. An attacker could exploit this vulnerability by sending crafted DNS packets that match a static NAT rule with DNS inspection enabled through an affected device. A successful exploit could allow the attacker to create an infinite loop and cause the device to reload, resulting in a DoS condition."}, {"lang": "es", "value": "Una vulnerabilidad en la funci\u00f3n que realiza la inspecci\u00f3n de DNS de la Traducci\u00f3n de Direcciones de Red (NAT) IPv4 e IPv6 para el software Cisco Secure Firewall Adaptive Security Appliance (ASA) y el software Cisco Secure Firewall Threat Defense (FTD) podr\u00eda permitir que un atacante remoto no autenticado reinicie el dispositivo inesperadamente, lo que resulta en una denegaci\u00f3n de servicio (DoS). Esta vulnerabilidad se debe a un bucle infinito que se produce cuando un dispositivo Cisco Secure ASA o Cisco Secure FTD procesa paquetes DNS con la inspecci\u00f3n de DNS habilitada y est\u00e1 configurado para NAT44, NAT64 o NAT46. Un atacante podr\u00eda explotar esta vulnerabilidad enviando paquetes DNS manipulados que coincidan con una regla NAT est\u00e1tica con la inspecci\u00f3n de DNS habilitada a trav\u00e9s de un dispositivo afectado. Una explotaci\u00f3n exitosa podr\u00eda permitir al atacante crear un bucle infinito y provocar la recarga del dispositivo, lo que resulta en una denegaci\u00f3n de servicio (DoS)."}], "lastModified": "2026-04-15T00:35:42.020", "sourceIdentifier": "psirt@cisco.com"}