{"id":"UBUNTU-CVE-2023-28450","details":"An issue was discovered in Dnsmasq before 2.90. The default maximum EDNS.0 UDP packet size was set to 4096 but should be 1232 because of DNS Flag Day 2020.","modified":"2026-02-04T02:20:28.242976Z","published":"2023-03-15T21:15:00Z","related":["USN-6034-1","USN-6657-1","USN-6657-2"],"upstream":["CVE-2023-28450"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2023-28450"},{"type":"REPORT","url":"https://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=blob;f=CHANGELOG"},{"type":"REPORT","url":"https://capec.mitre.org/data/definitions/495.html"},{"type":"REPORT","url":"https://thekelleys.org.uk/dnsmasq/doc.html"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6034-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6657-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2023-28450"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6657-2"}],"affected":[{"package":{"name":"dnsmasq","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/dnsmasq@2.68-1ubuntu0.2+esm2?arch=source&distro=trusty/esm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.68-1ubuntu0.2+esm2"}]}],"versions":["2.66-4ubuntu1","2.67-1","2.68-1","2.68-1ubuntu0.1","2.68-1ubuntu0.2","2.68-1ubuntu0.2+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"dnsmasq","binary_version":"2.68-1ubuntu0.2+esm2"},{"binary_name":"dnsmasq-base","binary_version":"2.68-1ubuntu0.2+esm2"},{"binary_name":"dnsmasq-utils","binary_version":"2.68-1ubuntu0.2+esm2"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-28450.json"}},{"package":{"name":"dnsmasq","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/dnsmasq@2.79-1ubuntu0.16.04.1+esm2?arch=source&distro=esm-infra/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.79-1ubuntu0.16.04.1+esm2"}]}],"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","2.79-1ubuntu0.16.04.1+esm1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"dnsmasq","binary_version":"2.79-1ubuntu0.16.04.1+esm2"},{"binary_name":"dnsmasq-base","binary_version":"2.79-1ubuntu0.16.04.1+esm2"},{"binary_name":"dnsmasq-base-lua","binary_version":"2.79-1ubuntu0.16.04.1+esm2"},{"binary_name":"dnsmasq-utils","binary_version":"2.79-1ubuntu0.16.04.1+esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-28450.json"}},{"package":{"name":"dnsmasq","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/dnsmasq@2.79-1ubuntu0.7?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.79-1ubuntu0.7"}]}],"versions":["2.78-1","2.78-3","2.79-1","2.79-1ubuntu0.2","2.79-1ubuntu0.3","2.79-1ubuntu0.4","2.79-1ubuntu0.5","2.79-1ubuntu0.6"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"2.79-1ubuntu0.7","binary_name":"dnsmasq"},{"binary_name":"dnsmasq-base","binary_version":"2.79-1ubuntu0.7"},{"binary_name":"dnsmasq-base-lua","binary_version":"2.79-1ubuntu0.7"},{"binary_name":"dnsmasq-utils","binary_version":"2.79-1ubuntu0.7"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-28450.json"}},{"package":{"name":"dnsmasq","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/dnsmasq@2.80-1.1ubuntu1.7?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.80-1.1ubuntu1.7"}]}],"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"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"dnsmasq","binary_version":"2.80-1.1ubuntu1.7"},{"binary_name":"dnsmasq-base","binary_version":"2.80-1.1ubuntu1.7"},{"binary_name":"dnsmasq-base-lua","binary_version":"2.80-1.1ubuntu1.7"},{"binary_name":"dnsmasq-utils","binary_version":"2.80-1.1ubuntu1.7"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-28450.json"}},{"package":{"name":"dnsmasq","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/dnsmasq@2.86-1.1ubuntu0.3?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.86-1.1ubuntu0.3"}]}],"versions":["2.85-1ubuntu2","2.86-1.1","2.86-1.1ubuntu0.1","2.86-1.1ubuntu0.2"],"ecosystem_specific":{"binaries":[{"binary_version":"2.86-1.1ubuntu0.3","binary_name":"dnsmasq"},{"binary_name":"dnsmasq-base","binary_version":"2.86-1.1ubuntu0.3"},{"binary_version":"2.86-1.1ubuntu0.3","binary_name":"dnsmasq-base-lua"},{"binary_version":"2.86-1.1ubuntu0.3","binary_name":"dnsmasq-utils"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-28450.json"}}],"schema_version":"1.7.3","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":"low"}]}