{"id":"USN-6657-1","summary":"dnsmasq vulnerabilities","details":"Elias Heftrig, Haya Schulmann, Niklas Vogel, and Michael Waidner discovered\nthat Dnsmasq icorrectly handled validating DNSSEC messages. A remote\nattacker could possibly use this issue to cause Dnsmasq to consume\nresources, leading to a denial of service. (CVE-2023-50387)\n\nIt was discovered that Dnsmasq incorrectly handled preparing an NSEC3\nclosest encloser proof. A remote attacker could possibly use this issue to\ncause Dnsmasq to consume resources, leading to a denial of service.\n(CVE-2023-50868)\n\nIt was discovered that Dnsmasq incorrectly set the maximum EDNS.0 UDP\npacket size as required by DNS Flag Day 2020. This issue only affected\nUbuntu 23.10. (CVE-2023-28450)\n","modified":"2026-04-27T17:17:21.560657954Z","published":"2024-02-26T13:52:13Z","related":["UBUNTU-CVE-2023-28450","UBUNTU-CVE-2023-50387","UBUNTU-CVE-2023-50868"],"upstream":["CVE-2023-28450","CVE-2023-50387","CVE-2023-50868","UBUNTU-CVE-2023-28450","UBUNTU-CVE-2023-50387","UBUNTU-CVE-2023-50868"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6657-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2023-28450"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2023-50387"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2023-50868"}],"affected":[{"package":{"name":"dnsmasq","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/dnsmasq@2.90-0ubuntu0.20.04.1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.90-0ubuntu0.20.04.1"}]}],"versions":["2.80-1ubuntu2","2.80-1ubuntu4","2.80-1.1ubuntu1","2.80-1.1ubuntu1.2","2.80-1.1ubuntu1.3","2.80-1.1ubuntu1.4","2.80-1.1ubuntu1.5","2.80-1.1ubuntu1.6","2.80-1.1ubuntu1.7"],"ecosystem_specific":{"binaries":[{"binary_name":"dnsmasq","binary_version":"2.90-0ubuntu0.20.04.1"},{"binary_name":"dnsmasq-base","binary_version":"2.90-0ubuntu0.20.04.1"},{"binary_name":"dnsmasq-base-lua","binary_version":"2.90-0ubuntu0.20.04.1"},{"binary_name":"dnsmasq-utils","binary_version":"2.90-0ubuntu0.20.04.1"}],"availability":"No subscription required"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:20.04:LTS","cves":[{"id":"CVE-2023-50387","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2023-50868","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-6657-1.json"}},{"package":{"name":"dnsmasq","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/dnsmasq@2.90-0ubuntu0.22.04.1?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.90-0ubuntu0.22.04.1"}]}],"versions":["2.85-1ubuntu2","2.86-1.1","2.86-1.1ubuntu0.1","2.86-1.1ubuntu0.2","2.86-1.1ubuntu0.3","2.86-1.1ubuntu0.4","2.86-1.1ubuntu0.5"],"ecosystem_specific":{"binaries":[{"binary_name":"dnsmasq","binary_version":"2.90-0ubuntu0.22.04.1"},{"binary_name":"dnsmasq-base","binary_version":"2.90-0ubuntu0.22.04.1"},{"binary_name":"dnsmasq-base-lua","binary_version":"2.90-0ubuntu0.22.04.1"},{"binary_name":"dnsmasq-utils","binary_version":"2.90-0ubuntu0.22.04.1"}],"availability":"No subscription required"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:22.04:LTS","cves":[{"id":"CVE-2023-50387","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2023-50868","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-6657-1.json"}}],"schema_version":"1.7.5"}