{"id":"CVE-2026-20222","title":"A vulnerability in the EIGRP implementation in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, adjacent attacker to cause the device…","summary":"A vulnerability in the EIGRP implementation in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, adjacent attacker to cause the device…","severity":"high","cvss":7.4,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","cwe":["CWE-401"],"vendor":"Cisco","product":"Cisco Secure Firewall Adaptive Security Appliance (ASA) Software","affected":["secure_firewall_adaptive_security_appliance_asa_software 9.19.1","secure_firewall_adaptive_security_appliance_asa_software 9.19.1.5","secure_firewall_adaptive_security_appliance_asa_software 9.19.1.9","secure_firewall_adaptive_security_appliance_asa_software 9.19.1.12","secure_firewall_adaptive_security_appliance_asa_software 9.19.1.18","secure_firewall_adaptive_security_appliance_asa_software 9.20.1","secure_firewall_adaptive_security_appliance_asa_software 9.19.1.22","secure_firewall_adaptive_security_appliance_asa_software 9.20.1.5","secure_firewall_adaptive_security_appliance_asa_software 9.19.1.24","secure_firewall_adaptive_security_appliance_asa_software 9.20.2","secure_firewall_adaptive_security_appliance_asa_software 9.19.1.27","secure_firewall_adaptive_security_appliance_asa_software 9.20.2.10","secure_firewall_adaptive_security_appliance_asa_software 9.19.1.28","secure_firewall_adaptive_security_appliance_asa_software 9.20.2.21","secure_firewall_adaptive_security_appliance_asa_software 9.19.1.31","secure_firewall_adaptive_security_appliance_asa_software 9.20.2.22","secure_firewall_adaptive_security_appliance_asa_software 9.20.3","secure_firewall_adaptive_security_appliance_asa_software 9.23.1","secure_firewall_adaptive_security_appliance_asa_software 9.22.1.1","secure_firewall_adaptive_security_appliance_asa_software 9.20.3.4","secure_firewall_adaptive_security_appliance_asa_software 9.20.3.7","secure_firewall_adaptive_security_appliance_asa_software 9.19.1.37","secure_firewall_adaptive_security_appliance_asa_software 9.20.3.9","secure_firewall_adaptive_security_appliance_asa_software 9.19.1.38","secure_firewall_adaptive_security_appliance_asa_software 9.22.1.3","secure_firewall_adaptive_security_appliance_asa_software 9.20.3.10","secure_firewall_adaptive_security_appliance_asa_software 9.22.1.2","secure_firewall_adaptive_security_appliance_asa_software 9.20.3.13","secure_firewall_adaptive_security_appliance_asa_software 9.22.1.6","secure_firewall_adaptive_security_appliance_asa_software 9.22.2","secure_firewall_adaptive_security_appliance_asa_software 9.20.3.16","secure_firewall_adaptive_security_appliance_asa_software 9.19.1.42","secure_firewall_adaptive_security_appliance_asa_software 9.23.1.3","secure_firewall_adaptive_security_appliance_asa_software 9.20.3.20","secure_firewall_adaptive_security_appliance_asa_software 9.22.2.4","secure_firewall_adaptive_security_appliance_asa_software 9.23.1.7","secure_firewall_adaptive_security_appliance_asa_software 9.20.4","secure_firewall_adaptive_security_appliance_asa_software 9.22.2.9","secure_firewall_adaptive_security_appliance_asa_software 9.23.1.13","secure_firewall_adaptive_security_appliance_asa_software 9.20.4.7","secure_firewall_adaptive_security_appliance_asa_software 9.22.2.13","secure_firewall_adaptive_security_appliance_asa_software 9.20.4.10","secure_firewall_adaptive_security_appliance_asa_software 9.23.1.19","secure_firewall_adaptive_security_appliance_asa_software 9.22.2.14","secure_firewall_adaptive_security_appliance_asa_software 9.24.1","secure_firewall_adaptive_security_appliance_asa_software 9.23.1.22","secure_firewall_adaptive_security_appliance_asa_software 9.20.4.14","secure_firewall_adaptive_security_appliance_asa_software 9.22.2.20","secure_firewall_adaptive_security_appliance_asa_software 9.20.4.19","secure_firewall_adaptive_security_appliance_asa_software 9.23.1.26"],"published":"2026-09-16","updated":"2026-09-18","sourceUpdated":"2026-09-18T13:28:28.567","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-20222","references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-eigrp-dos-GOhNejSj","label":"psirt@cisco.com"},{"url":"https://software.cisco.com"}],"tags":["nvd","cve.org","csaf","vendor-advisory","cisco"],"epss":0.00167,"epssPercentile":0.06404,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-17T14:52:36.394409Z"},"ingestedAt":"2026-09-16T16:37:52.164Z","slug":"CVE-2026-20222","body":"## Overview\n\nA vulnerability in the EIGRP implementation in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, adjacent attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition.\r\n\r\nThis vulnerability is due to improper resource management when handling EIGRP update messages. An attacker could exploit this vulnerability by sending crafted EIGRP updates at a high rate to an affected device. A successful exploit could allow the attacker to trigger a memory leak that will eventually cause the affected device to reload unexpectedly.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **cisco-sa-asaftd-eigrp-dos-GOhNejSj** · Cisco · affected: Cisco Firepower 2100 Series, Cisco Firepower 1000 Series, Cisco 3000 Series Industrial Security Appliances (ISA), Cisco Firepower 9000 Series, Cisco Firepower 4100 Series, Cisco Adaptive Security Virtual Appliance (ASAv), … · updated 2026-09-18 · [advisory](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-eigrp-dos-GOhNejSj)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":40.7,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}