{"id":"USN-5034-2","summary":"c-ares vulnerability","details":"USN-5034-1 fixed a vulnerability in c-ares. This update provides\nthe corresponding update for Ubuntu 16.04 ESM.\n\nOriginal advisory details:\n\n Philipp Jeitner and Haya Shulman discovered that c-ares incorrectly\n validated certain hostnames returned by DNS servers. A remote attacker\n could possibly use this issue to perform Domain Hijacking attacks.\n","modified":"2026-06-25T13:30:41.494024644Z","published":"2021-08-10T17:15:47Z","related":["UBUNTU-CVE-2021-3672"],"upstream":["CVE-2021-3672","UBUNTU-CVE-2021-3672"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5034-2"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-3672"}],"affected":[{"package":{"name":"c-ares","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/c-ares?arch=source&distro=esm-infra%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.10.0-3ubuntu0.2+esm1"}]}],"versions":["1.10.0-2","1.10.0-3","1.10.0-3ubuntu0.1","1.10.0-3ubuntu0.2"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_version":"1.10.0-3ubuntu0.2+esm1","binary_name":"libc-ares2"}]},"database_specific":{"cves_map":{"cves":[{"severity":[{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2021-3672"}],"ecosystem":"Ubuntu:Pro:16.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-5034-2.json"}}],"schema_version":"1.7.5"}