CVE-2020-13849: Mqtt

High severity, CVSS 7.5. EPSS: 2% chance of exploitation in the next 30 days.

The MQTT protocol 3.1.1 requires a server to set a timeout value of 1.5 times the Keep-Alive value specified by a client, which allows remote attackers to cause a denial of service (loss of the ability to establish new connections), as demonstrated by SlowITe.

Affected products

• Mqtt Mqtt: version 3.1.1 only

Published 2020-06-04. Last modified 2026-06-17.