{"id":"CVE-2021-3448","details":"A flaw was found in dnsmasq in versions before 2.85. When configured to use a specific server for a given network interface, dnsmasq uses a fixed port while forwarding queries. An attacker on the network, able to find the outgoing port used by dnsmasq, only needs to guess the random transmission ID to forge a reply and get it accepted by dnsmasq. This flaw makes a DNS Cache Poisoning attack much easier. The highest threat from this vulnerability is to data integrity.","modified":"2026-04-16T04:38:25.241498719Z","published":"2021-04-08T23:15:12.597Z","related":["ALSA-2021:4153","SUSE-SU-2021:3530-1","SUSE-SU-2022:1288-1","SUSE-SU-2022:1289-1","SUSE-SU-2022:14940-1","SUSE-SU-2022:14941-1","openSUSE-SU-2021:1426-1","openSUSE-SU-2021:3530-1","openSUSE-SU-2024:10721-1"],"references":[{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CVTJUOFFFHINLKWAOC2ZSC5MOPD4SJ24/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FHG7GWSQWKF7JXIMLOGJBKZWBB4VIAJ7/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GHURNEHHUBSW45KMIZ4FNBCSUPWPGV5V/"},{"type":"ADVISORY","url":"https://security.gentoo.org/glsa/202105-20"},{"type":"FIX","url":"https://www.oracle.com/security-alerts/cpujan2022.html"},{"type":"FIX","url":"https://bugzilla.redhat.com/show_bug.cgi?id=1939368"}],"affected":[{"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"0"},{"fixed":"2.85"}]},{"events":[{"introduced":"0"},{"last_affected":"8.0"}]},{"events":[{"introduced":"0"},{"last_affected":"32"}]},{"events":[{"introduced":"0"},{"last_affected":"33"}]},{"events":[{"introduced":"0"},{"last_affected":"34"}]},{"events":[{"introduced":"0"},{"last_affected":"1.9.0"}]},{"events":[{"introduced":"0"},{"fixed":"2.85"}]}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-3448.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N"}]}