{"schemaVersion":3,"id":"CVE-2021-34704","aliases":[],"status":"published","duplicateOf":null,"title":null,"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.","dates":{"published":"2022-01-11T18:50:10.799Z","modified":"2024-11-06T16:47:25.058Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":8.6,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":8.6,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":7.1,"severity":"high","vector":"AV:N/AC:M/Au:N/C:N/I:N/A:C","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.01318,"percentile":0.70349,"severity":"low","asOf":"2026-10-18T00:00:00.000Z","change":{"pp":0.011000000000000072,"baselineDate":"2026-09-18T00:00:00.000Z","baselineScore":0.01307},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01318,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01318,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01318,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01318,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01318,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01318,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01318,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01318,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01318,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01318,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01318,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01318,"percentile":0.70349}],"last30":[{"date":"2026-09-18T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01307,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01318,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01318,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01318,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01318,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01318,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01318,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01318,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01318,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01318,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01318,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01318,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01318,"percentile":0.70349}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-121","name":"Stack-based Buffer Overflow","description":"A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).","type":"weakness","status":"Draft","abstraction":"Variant","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/121.html"},{"id":"CWE-787","name":"Out-of-bounds Write","description":"The product writes data past the end, or before the beginning, of the intended buffer.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/787.html"}],"affected":[{"vendor":"cisco","product":"adaptive_security_appliance_software","name":"adaptive security appliance software","label":"adaptive_security_appliance_software","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"≥ 9.15, < 9.15.1.17","noFixRecorded":false,"fixedIn":null},{"text":"≥ 9.16, < 9.16.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 9.15, < 9.15.1.17 | ≥ 9.16, < 9.16.2","eol":null,"hubHref":"/vendor/cisco/adaptive_security_appliance_software"},{"vendor":"cisco","product":"cisco adaptive security appliance software","name":"Cisco Adaptive Security Appliance Software","label":"cisco adaptive security appliance software","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ unspecified, < 6.4.0.13","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ unspecified, < 6.4.0.13","eol":null,"hubHref":"/vendor/cisco/cisco_adaptive_security_appliance_software"},{"vendor":"cisco","product":"cisco firepower threat defense software","name":"Cisco Firepower Threat Defense Software","label":"cisco firepower threat defense software","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ unspecified, < 6.6.5","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ unspecified, < 6.6.5","eol":null,"hubHref":"/vendor/cisco/cisco_firepower_threat_defense_software"},{"vendor":"cisco","product":"secure_firewall_threat_defense","name":"secure firewall threat defense","label":"secure_firewall_threat_defense","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 6.7.0, < 6.7.0.3","noFixRecorded":false,"fixedIn":null},{"text":"7.0.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 6.7.0, < 6.7.0.3 | 7.0.0","eol":null,"hubHref":"/vendor/cisco/secure_firewall_threat_defense"}],"affectedCount":4,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asafdt-webvpn-dos-KSqJAKPA","label":"tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asafdt-webvpn-dos-KSqJAKPA","hostname":"tools.cisco.com","tags":["Vendor Advisory","X Refsource CISCO"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2022-01-11T18:50:10.799Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-11-06T16:47:25.058Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":35,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T11:13:13.626Z","stale":false,"partial":false}}