{"id":"UBUNTU-CVE-2023-5632","details":"In Eclipse Mosquito before and including 2.0.5, establishing a connection to the mosquitto server without sending data causes the EPOLLOUT event to be added, which results excessive CPU consumption. This could be used by a malicious actor to perform denial of service type attack. This issue is fixed in 2.0.6","modified":"2025-07-16T07:46:39.339473Z","published":"2023-10-18T09:15:00Z","withdrawn":"2025-07-18T16:54:11Z","upstream":["CVE-2023-5632"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2023-5632"},{"type":"REPORT","url":"https://github.com/eclipse/mosquitto/pull/2053"},{"type":"REPORT","url":"https://github.com/eclipse/mosquitto/commit/18bad1ff32435e523d7507e9b2ce0010124a8f2d"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2023-5632"}],"affected":[{"package":{"name":"mosquitto","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/mosquitto@2.0.11-1ubuntu1?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.11-1ubuntu1"}]}],"versions":["2.0.11-1","2.0.11-1build1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"libmosquitto-dev","binary_version":"2.0.11-1ubuntu1"},{"binary_name":"libmosquitto1","binary_version":"2.0.11-1ubuntu1"},{"binary_name":"libmosquitto1-dbgsym","binary_version":"2.0.11-1ubuntu1"},{"binary_name":"libmosquittopp-dev","binary_version":"2.0.11-1ubuntu1"},{"binary_name":"libmosquittopp1","binary_version":"2.0.11-1ubuntu1"},{"binary_name":"libmosquittopp1-dbgsym","binary_version":"2.0.11-1ubuntu1"},{"binary_name":"mosquitto","binary_version":"2.0.11-1ubuntu1"},{"binary_name":"mosquitto-clients","binary_version":"2.0.11-1ubuntu1"},{"binary_name":"mosquitto-clients-dbgsym","binary_version":"2.0.11-1ubuntu1"},{"binary_name":"mosquitto-dbgsym","binary_version":"2.0.11-1ubuntu1"},{"binary_name":"mosquitto-dev","binary_version":"2.0.11-1ubuntu1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-5632.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":"medium"}]}