CVE-2017-7653: Input Validation
Last updated 26 August 2025
Other sources
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.
— Launchpad
Affected Software
Event History
Frequently Asked Questions
What is CVE-2017-7653?
CVE-2017-7653 is a vulnerability in the Eclipse Mosquitto broker up to version 1.4.15 that allows a malicious client to cause a denial of service by sending a topic string that is not valid UTF-8.
How severe is CVE-2017-7653?
CVE-2017-7653 has a severity rating of 5.3 (medium).
How does CVE-2017-7653 affect Eclipse Mosquitto?
CVE-2017-7653 affects Eclipse Mosquitto broker up to version 1.4.15.
How can a malicious client exploit CVE-2017-7653?
A malicious client can exploit CVE-2017-7653 by sending a topic string that is not valid UTF-8, causing other clients to disconnect from the broker.
Are there any remedies for CVE-2017-7653?
Yes, there are remedies available for CVE-2017-7653, such as updating to a fixed version of Eclipse Mosquitto.