{"action":"Upgrade mosquitto to 2.0.10-1 or later.","affected":[{"fixed":"2.0.10-1","introduced":"0"}],"component":"mosquitto","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:13","exploited":false,"fixed_versions":["2.0.10-1"],"id":"tcs_01M5NFH5PB8DSBVMKWAYHHR9ZT","modified_at":"2026-10-23T18:04:49.724468326Z","published_at":"2021-04-07T19:15:12.347Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2021-28166","https://security-tracker.debian.org/tracker/CVE-2021-28166"],"severity":{"label":"medium","score":6.5},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2021-28166#Debian:13/mosquitto","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2021-28166"}],"summary":"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."}