CVE-2023-5632: Eclipse Mosquitto

High severity, CVSS 7.5. EPSS: 0.7% chance of exploitation in the next 30 days.

In Eclipse Mosquito before and including 2.0.5, establishing a connection to the mosquitto server without sending data causes the EPOLLOUT event to be added, which results excessive CPU consumption. This could be used by a malicious actor to perform denial of service type attack. This issue is fixed in 2.0.6

Affected products

• Eclipse Mosquitto: version 2.0.5 only

Published 2023-10-18. Last modified 2026-06-17.