CVE-2019-11777: Eclipse Paho Java Client

High severity, CVSS 7.5. EPSS: 0.8% chance of exploitation in the next 30 days.

In the Eclipse Paho Java client library version 1.2.0, when connecting to an MQTT server using TLS and setting a host name verifier, the result of that verification is not checked. This could allow one MQTT server to impersonate another and provide the client library with incorrect information.

Affected products

• Eclipse Paho Java Client: version 1.2.0 only

Published 2019-09-11. Last modified 2026-06-17.