The Eclipse Mosquitto broker up to version 1.4.15 does not reject strings that are not valid UTF-8. A malicious client could cause other clients that do reject invalid UTF-8 strings to disconnect themselves from the broker by sending a topic string which is not valid UTF-8, and so cause a denial of service for the clients.
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{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "binary_version": "1.4.15-2ubuntu0.18.04.3", "binary_name": "libmosquitto-dev" }, { "binary_version": "1.4.15-2ubuntu0.18.04.3", "binary_name": "libmosquitto1" }, { "binary_version": "1.4.15-2ubuntu0.18.04.3", "binary_name": "libmosquitto1-dbg" }, { "binary_version": "1.4.15-2ubuntu0.18.04.3", "binary_name": "libmosquittopp-dev" }, { "binary_version": "1.4.15-2ubuntu0.18.04.3", "binary_name": "libmosquittopp1" }, { "binary_version": "1.4.15-2ubuntu0.18.04.3", "binary_name": "libmosquittopp1-dbg" }, { "binary_version": "1.4.15-2ubuntu0.18.04.3", "binary_name": "mosquitto" }, { "binary_version": "1.4.15-2ubuntu0.18.04.3", "binary_name": "mosquitto-clients" }, { "binary_version": "1.4.15-2ubuntu0.18.04.3", "binary_name": "mosquitto-dbg" }, { "binary_version": "1.4.15-2ubuntu0.18.04.3", "binary_name": "mosquitto-dev" } ] }