{"id":"CVE-2021-28166","details":"In Eclipse Mosquitto version 2.0.0 to 2.0.9, if an authenticated client that had connected with MQTT v5 sent a crafted CONNACK message to the broker, a NULL pointer dereference would occur.","modified":"2026-03-14T01:43:56.768697Z","published":"2021-04-07T19:15:12.347Z","related":["openSUSE-SU-2024:11057-1"],"references":[{"type":"FIX","url":"https://bugs.eclipse.org/bugs/show_bug.cgi?id=572608"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/eclipse/mosquitto","events":[{"introduced":"c00671af5c25593bebf065ed8820f7f00ee85efe"},{"last_affected":"c03c6b765e3af813d2001d21f95e0808f708d075"}],"database_specific":{"versions":[{"introduced":"2.0.0"},{"last_affected":"2.0.9"}]}}],"versions":["v2.0.0","v2.0.1","v2.0.2","v2.0.3","v2.0.4","v2.0.5","v2.0.6","v2.0.7","v2.0.8","v2.0.9"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-28166.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}