### [CVE-2021-28166](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-28166)
![](https://img.shields.io/static/v1?label=Product&message=Eclipse%20Mosquitto&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=%3E%3D%202.0%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-476%3A%20NULL%20Pointer%20Dereference&color=brighgreen)

### Description

In Eclipse Mosquitto version 2.0.0 to 2.0.9, if an authenticated client that had connected with MQTT v5 sent a crafted CONNACK message to the broker, a NULL pointer dereference would occur.

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/PBearson/FUME-Fuzzing-MQTT-Brokers