{"schemaVersion":3,"id":"CVE-2019-10190","aliases":["UBUNTU-CVE-2019-10190","DEBIAN-CVE-2019-10190"],"status":"published","duplicateOf":null,"title":null,"description":"A vulnerability was discovered in DNS resolver component of knot resolver through version 3.2.0 before 4.1.0 which allows remote attackers to bypass DNSSEC validation for non-existence answer. NXDOMAIN answer would get passed through to the client even if its DNSSEC validation failed, instead of sending a SERVFAIL packet. Caching is not affected by this particular bug but see CVE-2019-10191.","dates":{"published":"2019-07-16T17:50:05.000Z","modified":"2025-02-13T16:27:20.781Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.5,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.0","versionLabel":"v3.0","source":"CVE.org","score":5.4,"severity":"medium","vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","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:H/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.0","versionLabel":"v3.0","source":"NVD","score":5.4,"severity":"medium","vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/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},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","exploitability":10,"impact":6,"computed":true},{"version":"3.0","versionLabel":"v3.0","source":"OSV · Ubuntu","score":5.4,"severity":"medium","vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","exploitability":7.2,"impact":4.2,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","exploitability":10,"impact":6,"computed":true}]},"epss":{"probability":0.01993,"percentile":0.80386,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.01993},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01993,"percentile":0.80386}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01993,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01993,"percentile":0.80386}]},"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-20","name":"Improper Input Validation","description":"The product receives input or data, but it does\n        not validate or incorrectly validates that the input has the\n        properties that are required to process the data safely and\n        correctly.","type":"weakness","status":"Stable","abstraction":"Class","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/20.html"}],"affected":[{"vendor":"cz.nic","product":"knot-resolver","name":"knot-resolver","label":"knot-resolver","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"from 3.2.0 before 4.1.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"from 3.2.0 before 4.1.0","eol":null,"hubHref":"/vendor/cznic/knot-resolver"},{"vendor":"debian","product":"knot-resolver","name":"knot-resolver","label":"knot-resolver","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/knot-resolver","purlType":"deb","versions":[{"text":"< 5.0.1-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 5.0.1-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"knot-resolver","name":"knot-resolver","label":"knot-resolver","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/knot-resolver","purlType":"deb","versions":[{"text":"< 3.2.1-3ubuntu2.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.2.1-3ubuntu2.2","eol":null,"hubHref":null},{"vendor":"fedoraproject","product":"fedora","name":"fedora","label":"fedora","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"29","noFixRecorded":false,"fixedIn":null},{"text":"30","noFixRecorded":false,"fixedIn":null}],"versionsText":"29 | 30","eol":{"isEol":true,"eolDate":"2019-11-26T00:00:00.000Z","matchMethod":"cpe","cycle":{"name":"29","label":"29","eolFrom":"2019-11-26T00:00:00.000Z","isLts":false,"isMaintained":false,"latestVersion":null},"product":{"name":"fedora","label":"Fedora Linux","category":"os"}},"hubHref":"/vendor/fedoraproject/fedora"},{"vendor":"nic","product":"knot_resolver","name":"knot resolver","label":"knot_resolver","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≤ 3.2.0","noFixRecorded":false,"fixedIn":null},{"text":"≥ 4.0.0, < 4.1.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≤ 3.2.0 | ≥ 4.0.0, < 4.1.0","eol":null,"hubHref":"/vendor/nic/knot_resolver"}],"affectedCount":5,"eol":{"hasEol":true,"count":1},"references":[{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-10190","label":"bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-10190","hostname":"bugzilla.redhat.com","tags":["X Refsource CONFIRM","Issue Tracking","Third Party Advisory"]},{"url":"https://www.knot-resolver.cz/2019-07-10-knot-resolver-4.1.0.html","label":"www.knot-resolver.cz/2019-07-10-knot-resolver-4.1.0.html","hostname":"www.knot-resolver.cz","tags":["X Refsource CONFIRM","Release Notes","Vendor Advisory"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VZV5YZZ5766UIG2TFLFJL6EESQNAP5X5/","label":"lists.fedoraproject.org/archives/…","hostname":"lists.fedoraproject.org","tags":["Vendor Advisory","X Refsource FEDORA"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TMSSWBHINIX4WE6UDXWM66L7JYEK6XS6/","label":"lists.fedoraproject.org/archives/…","hostname":"lists.fedoraproject.org","tags":["Vendor Advisory","X Refsource FEDORA"]},{"url":"https://lists.debian.org/debian-lts-announce/2024/04/msg00017.html","label":"lists.debian.org/debian-lts-announce/2024/04/msg00017.html","hostname":"lists.debian.org","tags":[]},{"url":"https://ubuntu.com/security/CVE-2019-10190","label":"ubuntu.com/security/CVE-2019-10190","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2019-10190","label":"www.cve.org/CVERecord?id=CVE-2019-10190","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://ubuntu.com/security/notices/USN-7047-1","label":"ubuntu.com/security/notices/USN-7047-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2019-10190","label":"security-tracker.debian.org/tracker/CVE-2019-10190","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["DLA-3795-1","USN-7047-1"],"duplicates":[],"related":["USN-7047-1"]},"timeline":[{"kind":"published","date":"2019-07-16T17:50:05.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2025-02-13T16:27:20.781Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":30,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T08:27:19.878Z","stale":false,"partial":false}}