{"id":"UBUNTU-CVE-2019-10191","details":"A vulnerability was discovered in DNS resolver of knot resolver before version 4.1.0 which allows remote attackers to downgrade DNSSEC-secure domains to DNSSEC-insecure state, opening possibility of domain hijack using attacks against insecure DNS protocol.","modified":"2026-04-22T12:01:39.601862Z","published":"2019-07-10T12:00:00Z","related":["USN-7047-1"],"upstream":["CVE-2019-10191"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2019-10191"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2019-10191"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-7047-1"}],"affected":[{"package":{"name":"knot-resolver","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/knot-resolver@1.0.0~beta3-1ubuntu0.1~esm1?arch=source&distro=esm-apps/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0.0~beta2-123-g6134920-1","1.0.0~beta3-1","1.0.0~beta3-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.0.0~beta3-1ubuntu0.1~esm1","binary_name":"knot-resolver"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-10191.json"}},{"package":{"name":"knot-resolver","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/knot-resolver@2.1.1-1ubuntu0.1~esm2?arch=source&distro=esm-apps/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.3-1","1.5.0-4","1.5.1-1","1.5.2-1","2.0.0-3","2.1.0-1","2.1.0-2","2.1.1-1","2.1.1-1ubuntu0.1~esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"2.1.1-1ubuntu0.1~esm2","binary_name":"knot-resolver"},{"binary_version":"2.1.1-1ubuntu0.1~esm2","binary_name":"knot-resolver-module-http"},{"binary_version":"2.1.1-1ubuntu0.1~esm2","binary_name":"libkres6"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-10191.json"}},{"package":{"name":"knot-resolver","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/knot-resolver@3.2.1-3ubuntu2.2?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.2.1-3ubuntu2.2"}]}],"versions":["3.2.1-3","3.2.1-3ubuntu1","3.2.1-3ubuntu2","3.2.1-3ubuntu2.1"],"ecosystem_specific":{"binaries":[{"binary_version":"3.2.1-3ubuntu2.2","binary_name":"knot-resolver"},{"binary_version":"3.2.1-3ubuntu2.2","binary_name":"knot-resolver-module-http"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-10191.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"type":"Ubuntu","score":"medium"}]}