Bug ID 2438129: MQTT traffic may cause BIG-IP crash

Last Modified: Sep 11, 2026

Affected Product(s):
BIG-IP LTM(all modules)

Known Affected Versions:
17.5.1.3, 17.5.1.4, 17.5.1.5, 17.5.1.6, 17.5.1.8, 17.5.1.9

Opened: Jul 23, 2026

Severity: 2-Critical

Symptoms

A virtual MQTT profile allows to handle MQTT traffic in BIG-IP. When MQTT is not licensed, it may result in a BIG-IP crash

Impact

BIG-IP crashes, resulting in failover and possible interruption in processing client traffic

Conditions

The virtual server is configured with the MQTT profile. MQTT protocol is not licensed

Workaround

Do not configure MQTT profile when MQTT protocol is not licensed

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips