{"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":"2026-02-10T04:42:13Z","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@2.79-1ubuntu0.16.04.1+esm1?arch=source&distro=esm-infra/xenial"},"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":{"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_version":"2.79-1ubuntu0.16.04.1+esm1","binary_name":"dnsmasq-base-lua"},{"binary_version":"2.79-1ubuntu0.16.04.1+esm1","binary_name":"dnsmasq-utils"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4976-2.json","cves_map":{"cves":[{"severity":[{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}],"id":"CVE-2021-3448"}],"ecosystem":"Ubuntu:Pro:16.04:LTS"}}}],"schema_version":"1.7.3"}