{"id":"USN-5034-1","summary":"c-ares vulnerability","details":"Philipp Jeitner and Haya Shulman discovered that c-ares incorrectly\nvalidated certain hostnames returned by DNS servers. A remote attacker\ncould possibly use this issue to perform Domain Hijacking attacks.\n","modified":"2026-04-22T10:30:53.402718Z","published":"2021-08-10T11:53:27Z","related":["UBUNTU-CVE-2021-3672"],"upstream":["CVE-2021-3672","UBUNTU-CVE-2021-3672"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5034-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-3672"}],"affected":[{"package":{"name":"c-ares","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/c-ares@1.14.0-1ubuntu0.1?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.14.0-1ubuntu0.1"}]}],"versions":["1.13.0-2","1.13.0-3","1.14.0-1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.14.0-1ubuntu0.1","binary_name":"libc-ares2"}],"availability":"No subscription required"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:18.04:LTS","cves":[{"id":"CVE-2021-3672","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L"},{"type":"Ubuntu","score":"medium"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-5034-1.json"}},{"package":{"name":"c-ares","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/c-ares@1.15.0-1ubuntu0.1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.15.0-1ubuntu0.1"}]}],"versions":["1.15.0-1build1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.15.0-1ubuntu0.1","binary_name":"libc-ares2"}],"availability":"No subscription required"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:20.04:LTS","cves":[{"id":"CVE-2021-3672","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L"},{"type":"Ubuntu","score":"medium"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-5034-1.json"}}],"schema_version":"1.7.5"}