{"schemaVersion":3,"id":"CVE-2025-20219","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"A vulnerability in the implementation of access control rules for loopback interfaces in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to send traffic that should have been blocked to a loopback interface.\n\nThis vulnerability is due to improper enforcement of access control rules for loopback interfaces. An attacker could exploit this vulnerability by sending traffic to a loopback interface on an affected device. A successful exploit could allow the attacker to bypass configured access control rules and send traffic that should have been blocked to a loopback interface on the device.","dates":{"published":"2025-08-14T16:28:40.010Z","modified":"2025-08-14T20:44:27.252Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":5.3,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","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":"3.1","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}]},"epss":{"probability":0.00383,"percentile":0.30888,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.00383},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00383,"percentile":0.30888}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00383,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00383,"percentile":0.30888}]},"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"}],"affected":[{"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":"9.18.2","noFixRecorded":false,"fixedIn":null},{"text":"9.18.2.5","noFixRecorded":false,"fixedIn":null},{"text":"9.18.2.7","noFixRecorded":false,"fixedIn":null},{"text":"9.19.1","noFixRecorded":false,"fixedIn":null},{"text":"9.18.2.8","noFixRecorded":false,"fixedIn":null},{"text":"9.18.3","noFixRecorded":false,"fixedIn":null},{"text":"9.19.1.5","noFixRecorded":false,"fixedIn":null},{"text":"9.19.1.9","noFixRecorded":false,"fixedIn":null},{"text":"9.18.3.39","noFixRecorded":false,"fixedIn":null},{"text":"9.19.1.12","noFixRecorded":false,"fixedIn":null},{"text":"9.18.3.46","noFixRecorded":false,"fixedIn":null},{"text":"9.19.1.18","noFixRecorded":false,"fixedIn":null},{"text":"9.18.3.53","noFixRecorded":false,"fixedIn":null},{"text":"9.18.3.55","noFixRecorded":false,"fixedIn":null},{"text":"9.18.3.56","noFixRecorded":false,"fixedIn":null},{"text":"9.20.1","noFixRecorded":false,"fixedIn":null},{"text":"9.19.1.22","noFixRecorded":false,"fixedIn":null},{"text":"9.18.4","noFixRecorded":false,"fixedIn":null},{"text":"9.20.1.5","noFixRecorded":false,"fixedIn":null},{"text":"9.18.4.5","noFixRecorded":false,"fixedIn":null},{"text":"9.19.1.24","noFixRecorded":false,"fixedIn":null},{"text":"9.18.4.8","noFixRecorded":false,"fixedIn":null},{"text":"9.20.2","noFixRecorded":false,"fixedIn":null},{"text":"9.19.1.27","noFixRecorded":false,"fixedIn":null},{"text":"9.18.4.22","noFixRecorded":false,"fixedIn":null},{"text":"9.20.2.10","noFixRecorded":false,"fixedIn":null},{"text":"9.19.1.28","noFixRecorded":false,"fixedIn":null},{"text":"9.18.4.24","noFixRecorded":false,"fixedIn":null},{"text":"9.20.2.21","noFixRecorded":false,"fixedIn":null},{"text":"9.19.1.31","noFixRecorded":false,"fixedIn":null},{"text":"9.18.4.29","noFixRecorded":false,"fixedIn":null},{"text":"9.20.2.22","noFixRecorded":false,"fixedIn":null},{"text":"9.18.4.34","noFixRecorded":false,"fixedIn":null},{"text":"9.20.3","noFixRecorded":false,"fixedIn":null},{"text":"9.18.4.40","noFixRecorded":false,"fixedIn":null},{"text":"9.22.1.1","noFixRecorded":false,"fixedIn":null},{"text":"9.20.3.4","noFixRecorded":false,"fixedIn":null},{"text":"9.18.4.47","noFixRecorded":false,"fixedIn":null},{"text":"9.20.3.7","noFixRecorded":false,"fixedIn":null},{"text":"9.19.1.37","noFixRecorded":false,"fixedIn":null},{"text":"9.20.3.9","noFixRecorded":false,"fixedIn":null},{"text":"9.19.1.38","noFixRecorded":false,"fixedIn":null},{"text":"9.18.4.50","noFixRecorded":false,"fixedIn":null},{"text":"9.22.1.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"9.18.2 | 9.18.2.5 | 9.18.2.7 | 9.19.1 | 9.18.2.8 | 9.18.3 | 9.19.1.5 | 9.19.1.9 | 9.18.3.39 | 9.19.1.12 | 9.18.3.46 | 9.19.1.18 | 9.18.3.53 | 9.18.3.55 | 9.18.3.56 | 9.20.1 | 9.19.1.22 | 9.18.4 | 9.20.1.5 | 9.18.4.5 | 9.19.1.24 | 9.18.4.8 | 9.20.2 | 9.19.1.27 | 9.18.4.22 | 9.20.2.10 | 9.19.1.28 | 9.18.4.24 | 9.20.2.21 | 9.19.1.31 | 9.18.4.29 | 9.20.2.22 | 9.18.4.34 | 9.20.3 | 9.18.4.40 | 9.22.1.1 | 9.20.3.4 | 9.18.4.47 | 9.20.3.7 | 9.19.1.37 | 9.20.3.9 | 9.19.1.38 | 9.18.4.50 | 9.22.1.2","eol":null,"hubHref":"/vendor/cisco/cisco_adaptive_security_appliance_asa_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":"7.3.0","noFixRecorded":false,"fixedIn":null},{"text":"7.3.1","noFixRecorded":false,"fixedIn":null},{"text":"7.3.1.1","noFixRecorded":false,"fixedIn":null},{"text":"7.4.0","noFixRecorded":false,"fixedIn":null},{"text":"7.4.1","noFixRecorded":false,"fixedIn":null},{"text":"7.4.1.1","noFixRecorded":false,"fixedIn":null},{"text":"7.3.1.2","noFixRecorded":false,"fixedIn":null},{"text":"7.6.0","noFixRecorded":false,"fixedIn":null},{"text":"7.4.2","noFixRecorded":false,"fixedIn":null},{"text":"7.4.2.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"7.3.0 | 7.3.1 | 7.3.1.1 | 7.4.0 | 7.4.1 | 7.4.1.1 | 7.3.1.2 | 7.6.0 | 7.4.2 | 7.4.2.1","eol":null,"hubHref":"/vendor/cisco/cisco_firepower_threat_defense_software"}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-ftd-acl-bypass-mtPze9Yh","label":"sec.cloudapps.cisco.com/security/…","hostname":"sec.cloudapps.cisco.com","tags":[]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2025-08-14T16:28:40.010Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2025-08-14T20:44:27.252Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":21,"level":"low","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T17:21:38.491Z","stale":false,"partial":false}}