Published: 25 April 2018
In Eclipse Mosquitto 1.4.14, if a Mosquitto instance is set running with a configuration file, then sending a HUP signal to server triggers the configuration to be reloaded from disk. If there are lots of clients connected so that there are no more file descriptors/sockets available (default limit typically 1024 file descriptors on Linux), then opening the configuration file will fail.
From the Ubuntu security team
It was discovered that Mosquitto incorrectly handled file descriptors. An attacker could possibly use this issue to cause a denial of service.
CVSS 3 base score: 7.5