{"id":"USN-4976-1","summary":"dnsmasq vulnerability","details":"Petr Mensik discovered that Dnsmasq incorrectly randomized source ports in\ncertain configurations. A remote attacker could possibly use this issue to\nfacilitate DNS cache poisoning attacks.\n","modified":"2026-02-10T04:42:13Z","published":"2021-06-02T13:21:40Z","related":["UBUNTU-CVE-2021-3448"],"upstream":["CVE-2021-3448","UBUNTU-CVE-2021-3448"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4976-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-3448"}],"affected":[{"package":{"name":"dnsmasq","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/dnsmasq@2.79-1ubuntu0.4?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.79-1ubuntu0.4"}]}],"versions":["2.78-1","2.78-3","2.79-1","2.79-1ubuntu0.2","2.79-1ubuntu0.3"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"dnsmasq","binary_version":"2.79-1ubuntu0.4"},{"binary_name":"dnsmasq-base","binary_version":"2.79-1ubuntu0.4"},{"binary_name":"dnsmasq-base-lua","binary_version":"2.79-1ubuntu0.4"},{"binary_name":"dnsmasq-utils","binary_version":"2.79-1ubuntu0.4"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:18.04:LTS","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"}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4976-1.json"}},{"package":{"name":"dnsmasq","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/dnsmasq@2.80-1.1ubuntu1.4?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.80-1.1ubuntu1.4"}]}],"versions":["2.80-1ubuntu2","2.80-1ubuntu4","2.80-1.1ubuntu1","2.80-1.1ubuntu1.2","2.80-1.1ubuntu1.3"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"dnsmasq","binary_version":"2.80-1.1ubuntu1.4"},{"binary_name":"dnsmasq-base","binary_version":"2.80-1.1ubuntu1.4"},{"binary_name":"dnsmasq-base-lua","binary_version":"2.80-1.1ubuntu1.4"},{"binary_name":"dnsmasq-utils","binary_version":"2.80-1.1ubuntu1.4"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:20.04:LTS","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"}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4976-1.json"}}],"schema_version":"1.7.3"}