{"id":"UBUNTU-CVE-2021-34434","details":"In Eclipse Mosquitto versions 2.0 to 2.0.11, when using the dynamic security plugin, if the ability for a client to make subscriptions on a topic is revoked when a durable client is offline, then existing subscriptions for that client are not revoked.","modified":"2026-04-22T14:48:11.886007Z","published":"2021-08-30T20:15:00Z","related":["USN-6492-1"],"upstream":["CVE-2021-34434"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-34434"},{"type":"REPORT","url":"https://bugs.eclipse.org/bugs/show_bug.cgi?id=575324"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6492-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-34434"}],"affected":[{"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/2021/UBUNTU-CVE-2021-34434.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"},{"type":"Ubuntu","score":"medium"}]}