{"id":"CVE-2020-3528","title":"A vulnerability in the OSPF Version 2 (OSPFv2) implementation of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause an affected devi…","summary":"A vulnerability in the OSPF Version 2 (OSPFv2) implementation of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause an affected devi…","severity":"high","cvss":8.6,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","cwe":["CWE-400","CWE-400"],"vendor":"cisco","product":"adaptive_security_appliance","affected":["adaptive_security_appliance < 9.6","secure_firewall_threat_defense < 6.3.0.6","secure_firewall_threat_defense >= 6.4.0, < 6.4.0.10","secure_firewall_threat_defense >= 6.5.0, < 6.5.0.5","secure_firewall_threat_defense >= 6.6.0, < 6.6.1","adaptive_security_appliance_software >= 9.8.0, < 9.8.4.26","adaptive_security_appliance_software >= 9.9.0, < 9.9.2.80","adaptive_security_appliance_software >= 9.10.0, < 9.10.1.44","adaptive_security_appliance_software >= 9.12.0, < 9.12.4.4","adaptive_security_appliance_software >= 9.13.0, < 9.13.1.13","adaptive_security_appliance_software >= 9.14.0, < 9.14.1.19"],"patched":["adaptive_security_appliance 9.6","secure_firewall_threat_defense 6.6.1","adaptive_security_appliance_software 9.14.1.19"],"published":"2020-10-21","updated":"2026-08-11","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2020-3528","references":[{"url":"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-ospflls-37Xy2q6r","label":"psirt@cisco.com"},{"url":"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-ospflls-37Xy2q6r","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.01433,"epssPercentile":0.71482,"ingestedAt":"2026-08-11T19:48:28.609Z","slug":"CVE-2020-3528","body":"## Overview\n\nA vulnerability in the OSPF Version 2 (OSPFv2) implementation of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerability is due to incomplete input validation when the affected software processes certain OSPFv2 packets with Link-Local Signaling (LLS) data. An attacker could exploit this vulnerability by sending a malformed OSPFv2 packet to an affected device. A successful exploit could allow the attacker to cause an affected device to reload, resulting in a DoS condition.\n\n## Affected\n\n- `adaptive_security_appliance < 9.6`\n- `secure_firewall_threat_defense < 6.3.0.6`\n- `secure_firewall_threat_defense >= 6.4.0, < 6.4.0.10`\n- `secure_firewall_threat_defense >= 6.5.0, < 6.5.0.5`\n- `secure_firewall_threat_defense >= 6.6.0, < 6.6.1`\n- `adaptive_security_appliance_software >= 9.8.0, < 9.8.4.26`\n- `adaptive_security_appliance_software >= 9.9.0, < 9.9.2.80`\n- `adaptive_security_appliance_software >= 9.10.0, < 9.10.1.44`\n- `adaptive_security_appliance_software >= 9.12.0, < 9.12.4.4`\n- `adaptive_security_appliance_software >= 9.13.0, < 9.13.1.13`\n- `adaptive_security_appliance_software >= 9.14.0, < 9.14.1.19`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `adaptive_security_appliance 9.6`\n- `secure_firewall_threat_defense 6.6.1`\n- `adaptive_security_appliance_software 9.14.1.19`","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":47.3,"likelihood":0.3,"exploitation":0,"ransomware":0},"changes":[]}