{"cve":{"cve_id":"CVE-2021-1573","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.01307,"epss_percentile":0.6847,"epss_as_of":"2026-08-26","description":"A vulnerability in the web services interface of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to trigger a denial of service (DoS) condition. This vulnerability is due to improper input validation when parsing HTTPS requests. An attacker could exploit this vulnerability by sending a malicious HTTPS request to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.","published_at":"2022-01-11T18:55:11.325000Z","last_modified_at":"2026-08-11T19:37:30.880000Z","cvss_v3_score":8.6,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","cvss_v3_severity":"HIGH","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":"none","ssvc_automatable":true,"ssvc_technical_impact":"partial","cwes":["CWE-121","CWE-787"],"nvd_references":["https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asafdt-webvpn-dos-KSqJAKPA"],"vuln_status":"Modified","trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:39.878444Z","updated_at":"2026-08-13T20:20:23.063882Z"},"effective_severity":"HIGH","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"C","value_label":"Changed"},{"metric":"C","name":"Confidentiality","value":"N","value_label":"None"},{"metric":"I","name":"Integrity","value":"N","value_label":"None"},{"metric":"A","name":"Availability","value":"H","value_label":"High"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"cisco","vendor_name":"Cisco","product_slug":"adaptive-security-appliance","product_name":"adaptive_security_appliance","version_start":null,"version_start_inclusive":null,"version_end":"9.7","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:cisco:adaptive_security_appliance:*:*:*:*:*:*:*:*"},{"vendor_slug":"cisco","vendor_name":"Cisco","product_slug":"adaptive-security-appliance-software","product_name":"adaptive_security_appliance_software","version_start":"9.8","version_start_inclusive":true,"version_end":"9.8.4.40","version_end_inclusive":false,"cpe23_uri":"cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*"},{"vendor_slug":"cisco","vendor_name":"Cisco","product_slug":"cisco-adaptive-security-appliance-software","product_name":"Cisco Adaptive Security Appliance Software","version_start":"unspecified","version_start_inclusive":true,"version_end":"6.4.0.13","version_end_inclusive":false,"cpe23_uri":"cve5:cisco:cisco-adaptive-security-appliance-software:unspecified:6.4.0.13"},{"vendor_slug":"cisco","vendor_name":"Cisco","product_slug":"cisco-firepower-threat-defense-software","product_name":"Cisco Firepower Threat Defense Software","version_start":"unspecified","version_start_inclusive":true,"version_end":"6.6.5","version_end_inclusive":false,"cpe23_uri":"cve5:cisco:cisco-firepower-threat-defense-software:unspecified:6.6.5"},{"vendor_slug":"cisco","vendor_name":"Cisco","product_slug":"secure-firewall-threat-defense","product_name":"secure_firewall_threat_defense","version_start":null,"version_start_inclusive":null,"version_end":"6.2.2","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:*"},{"vendor_slug":"cisco","vendor_name":"Cisco","product_slug":"secure-firewall-threat-defense","product_name":"secure_firewall_threat_defense","version_start":"7.0.0","version_start_inclusive":true,"version_end":"7.0.0","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:cisco:secure_firewall_threat_defense:7.0.0:*:*:*:*:*:*:*"}],"exploit_refs":[],"news":[],"references":[{"url":"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asafdt-webvpn-dos-KSqJAKPA","source_type":"VENDOR_ADVISORY","tags":["advisory"]}],"timeline":[{"type":"published","at":"2022-01-11T18:55:11.325000Z","label":"CVE published","source":null},{"type":"ssvc_changed","at":"2026-06-24T00:31:36.955378Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-06-24T00:31:36.955378Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-06-24T00:31:36.955378Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"cvss_changed","at":"2026-06-24T00:31:36.955378Z","label":"CVSS score revised","source":"vulnrichment"},{"type":"cvss_changed","at":"2026-06-24T00:31:36.955378Z","label":"CVSS score revised","source":"vulnrichment"},{"type":"cvss_changed","at":"2026-06-24T00:31:36.955378Z","label":"CVSS score revised","source":"vulnrichment"}]}