{"id":"CVE-2021-41039","details":"In versions 1.6 to 2.0.11 of Eclipse Mosquitto, an MQTT v5 client connecting with a large number of user-property properties could cause excessive CPU usage, leading to a loss of performance and possible denial of service.","modified":"2026-05-18T20:50:17.544034Z","published":"2021-12-01T20:15:07.933Z","references":[{"type":"ADVISORY","url":"https://www.debian.org/security/2023/dsa-5511"},{"type":"FIX","url":"https://bugs.eclipse.org/bugs/show_bug.cgi?id=575314"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/eclipse-mosquitto/mosquitto","events":[{"introduced":"4555ee79e513d9a6dc5c13d527c56cb2cfdd24d0"},{"last_affected":"3b89bb2e3532f99f0394b11a09ccc481cebcb0b2"}],"database_specific":{"extracted_events":[{"introduced":"1.6"},{"last_affected":"2.0.11"}],"source":"CPE_FIELD","cpe":"cpe:2.3:a:eclipse:mosquitto:*:*:*:*:*:*:*:*"}}],"versions":["v2.0.11","v2.0.10","v2.0.9","v2.0.8","v2.0.7","v2.0.6","v2.0.5","v2.0.4","v2.0.3","v2.0.2","v2.0.1","v2.0.0","v1.6.12","v1.6.11","v1.6.10","v1.6.9","v1.6.8","v1.6.7","v1.6.6","v1.6.5","v1.6.4","v1.6.3","v1.6.2","v1.6.1","v1.6"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-41039.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:N/I:N/A:H"}]}