{"id":"USN-4976-2","summary":"dnsmasq vulnerability","details":"USN-4976-1 fixed a vulnerability in Dnsmasq. This update provides\nthe corresponding update for Ubuntu 16.04 ESM.\n\nDnsmasq has been updated to 2.79-1 for Ubuntu 16.04 ESM in order to fix\nsome security issues.\n\nOriginal advisory details:\n\n Petr Mensik discovered that Dnsmasq incorrectly randomized source ports in\n certain configurations. A remote attacker could possibly use this issue to\n facilitate DNS cache poisoning attacks.\n","modified":"2026-06-25T13:30:38.170046541Z","published":"2022-09-07T15:22:39Z","related":["UBUNTU-CVE-2021-3448"],"upstream":["CVE-2021-3448","UBUNTU-CVE-2021-3448"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4976-2"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-3448"}],"affected":[{"package":{"name":"dnsmasq","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/dnsmasq?arch=source&distro=esm-infra%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.79-1ubuntu0.16.04.1+esm1"}]}],"versions":["2.75-1","2.75-1ubuntu0.16.04.1","2.75-1ubuntu0.16.04.2","2.75-1ubuntu0.16.04.3","2.75-1ubuntu0.16.04.4","2.75-1ubuntu0.16.04.5","2.75-1ubuntu0.16.04.7","2.75-1ubuntu0.16.04.8","2.75-1ubuntu0.16.04.10","2.75-1ubuntu0.16.04.10+esm1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_version":"2.79-1ubuntu0.16.04.1+esm1","binary_name":"dnsmasq"},{"binary_version":"2.79-1ubuntu0.16.04.1+esm1","binary_name":"dnsmasq-base"},{"binary_name":"dnsmasq-base-lua","binary_version":"2.79-1ubuntu0.16.04.1+esm1"},{"binary_name":"dnsmasq-utils","binary_version":"2.79-1ubuntu0.16.04.1+esm1"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:16.04:LTS","cves":[{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N"},{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N","type":"CVSS_V3"},{"type":"Ubuntu","score":"low"}],"id":"CVE-2021-3448"}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4976-2.json"}}],"schema_version":"1.7.5"}