{"id":"UBUNTU-CVE-2023-0809","details":"In Mosquitto before 2.0.16, excessive memory is allocated based on malicious initial packets that are not CONNECT packets.","modified":"2026-04-22T13:59:15.919645Z","published":"2023-10-02T19:15:00Z","related":["USN-6492-1"],"upstream":["CVE-2023-0809"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2023-0809"},{"type":"REPORT","url":"https://mosquitto.org/blog/2023/08/version-2-0-16-released/"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6492-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2023-0809"}],"affected":[{"package":{"name":"mosquitto","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/mosquitto@1.6.9-1ubuntu0.1~esm1?arch=source&distro=esm-apps/focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.6.9-1ubuntu0.1~esm1"}]}],"versions":["1.6.6-1","1.6.7-1","1.6.8-1","1.6.8-2","1.6.9-1~build1","1.6.9-1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"libmosquitto1","binary_version":"1.6.9-1ubuntu0.1~esm1"},{"binary_name":"libmosquittopp1","binary_version":"1.6.9-1ubuntu0.1~esm1"},{"binary_name":"mosquitto","binary_version":"1.6.9-1ubuntu0.1~esm1"},{"binary_name":"mosquitto-clients","binary_version":"1.6.9-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-0809.json"}},{"package":{"name":"mosquitto","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/mosquitto@2.0.11-1ubuntu1.1?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.11-1ubuntu1.1"}]}],"versions":["2.0.11-1","2.0.11-1build1","2.0.11-1ubuntu1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"libmosquitto1","binary_version":"2.0.11-1ubuntu1.1"},{"binary_name":"libmosquittopp1","binary_version":"2.0.11-1ubuntu1.1"},{"binary_name":"mosquitto","binary_version":"2.0.11-1ubuntu1.1"},{"binary_name":"mosquitto-clients","binary_version":"2.0.11-1ubuntu1.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-0809.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"type":"Ubuntu","score":"medium"}]}