USN-4023-1: Mosquitto vulnerabilities

20 June 2019

mosquitto vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 18.10
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS


Several security issues were fixed in Mosquitto.

Software Description

  • mosquitto - MQTT version compatible message broker


It was discovered that Mosquitto broker incorrectly handled certain specially crafted input and network packets. A remote attacker could use this to cause a denial of service.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 18.10
libmosquitto1 - 1.4.15-2ubuntu0.18.10.3
libmosquittopp1 - 1.4.15-2ubuntu0.18.10.3
mosquitto - 1.4.15-2ubuntu0.18.10.3
mosquitto-clients - 1.4.15-2ubuntu0.18.10.3
Ubuntu 18.04 LTS
libmosquitto1 - 1.4.15-2ubuntu0.18.04.3
libmosquittopp1 - 1.4.15-2ubuntu0.18.04.3
mosquitto - 1.4.15-2ubuntu0.18.04.3
mosquitto-clients - 1.4.15-2ubuntu0.18.04.3
Ubuntu 16.04 LTS
libmosquitto1 - 1.4.8-1ubuntu0.16.04.7
libmosquittopp1 - 1.4.8-1ubuntu0.16.04.7
mosquitto - 1.4.8-1ubuntu0.16.04.7
mosquitto-clients - 1.4.8-1ubuntu0.16.04.7

To update your system, please follow these instructions:

In general, a standard system update will make all the necessary changes.