{"schemaVersion":3,"id":"CVE-2020-3564","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"A vulnerability in the FTP inspection engine of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass FTP inspection. The vulnerability is due to ineffective flow tracking of FTP traffic. An attacker could exploit this vulnerability by sending crafted FTP traffic through an affected device. A successful exploit could allow the attacker to bypass FTP inspection and successfully complete FTP connections.","dates":{"published":"2020-10-21T18:40:58.904Z","modified":"2024-11-13T17:46:31.618Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":5.8,"severity":"medium","version":"3.0","versionLabel":"v3.0","source":"CVE.org","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.0","versionLabel":"v3.0","source":"CVE.org","score":5.8,"severity":"medium","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":5.3,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.0","versionLabel":"v3.0","source":"NVD","score":5.8,"severity":"medium","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":5,"severity":"medium","vector":"AV:N/AC:L/Au:N/C:N/I:P/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.01341,"percentile":0.70895,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":0.012000000000000031,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.01329},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01341,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01341,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01341,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01341,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01341,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01341,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01341,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01341,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01341,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01341,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01341,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01341,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01341,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01341,"percentile":0.70895}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01329,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01341,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01341,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01341,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01341,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01341,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01341,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01341,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01341,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01341,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01341,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01341,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01341,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01341,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01341,"percentile":0.70895}]},"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-284","name":"Improper Access Control","description":"The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.","type":"weakness","status":"Incomplete","abstraction":"Pillar","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/284.html"},{"id":"CWE-436","name":"Interpretation Conflict","description":"Product A handles inputs or steps differently than Product B, which causes A to perform incorrect actions based on its perception of B's state.","type":"weakness","status":"Incomplete","abstraction":"Class","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/436.html"}],"affected":[{"vendor":"cisco","product":"adaptive_security_appliance","name":"adaptive security appliance","label":"adaptive_security_appliance","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 9.6","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 9.6","eol":null,"hubHref":"/vendor/cisco/adaptive_security_appliance"},{"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":"≥ 9.8.0, < 9.8.4.26","noFixRecorded":false,"fixedIn":null},{"text":"≥ 9.9.0, < 9.9.2.80","noFixRecorded":false,"fixedIn":null},{"text":"≥ 9.10.0, < 9.10.1.44","noFixRecorded":false,"fixedIn":null},{"text":"≥ 9.12.0, < 9.12.4.4","noFixRecorded":false,"fixedIn":null},{"text":"≥ 9.13.0, < 9.13.1.13","noFixRecorded":false,"fixedIn":null},{"text":"≥ 9.14.0, < 9.14.1.19","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 9.8.0, < 9.8.4.26 | ≥ 9.9.0, < 9.9.2.80 | ≥ 9.10.0, < 9.10.1.44 | ≥ 9.12.0, < 9.12.4.4 | ≥ 9.13.0, < 9.13.1.13 | ≥ 9.14.0, < 9.14.1.19","eol":null,"hubHref":"/vendor/cisco/adaptive_security_appliance_software"},{"vendor":"cisco","product":"cisco adaptive security appliance (asa) software","name":"Cisco Adaptive Security Appliance (ASA) Software","label":"cisco adaptive security appliance (asa) software","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"n/a","noFixRecorded":false,"fixedIn":null}],"versionsText":"n/a","eol":null,"hubHref":"/vendor/cisco/cisco_adaptive_security_appliance_asa_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":"< 6.3.0.6","noFixRecorded":false,"fixedIn":null},{"text":"≥ 6.4.0, < 6.4.0.10","noFixRecorded":false,"fixedIn":null},{"text":"≥ 6.5.0, < 6.5.0.5","noFixRecorded":false,"fixedIn":null},{"text":"≥ 6.6.0, < 6.6.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 6.3.0.6 | ≥ 6.4.0, < 6.4.0.10 | ≥ 6.5.0, < 6.5.0.5 | ≥ 6.6.0, < 6.6.1","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-asaftd-ftpbypass-HY3UTxYu","label":"tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-ftpbypass-HY3UTxYu","hostname":"tools.cisco.com","tags":["Vendor Advisory","X Refsource CISCO"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2020-10-21T18:40:58.904Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-11-13T17:46:31.618Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":23,"level":"low","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T15:58:03.939Z","stale":false,"partial":false}}