{"action":"Upgrade mosquitto to 2.0.10-r0 or later.","affected":[{"fixed":"2.0.10-r0","introduced":"2.0.0"}],"component":"mosquitto","cve_ids":[],"ecosystem":"Alpine","ecosystem_qualifier":"Alpine:v3.17","exploited":false,"fixed_versions":["2.0.10-r0"],"id":"tcs_01M5ND2WHGYHTB8XT5BY1W4TQQ","modified_at":"2026-10-23T17:17:56.167959989Z","published_at":"2021-04-07T19:15:12.347Z","references":["https://osv.dev/vulnerability/ALPINE-CVE-2021-28166","https://security.alpinelinux.org/vuln/CVE-2021-28166"],"severity":{"label":"medium","score":6.5},"sources":[{"source":"osv","source_id":"ALPINE-CVE-2021-28166#Alpine:v3.17/mosquitto","url":"https://osv.dev/vulnerability/ALPINE-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."}