cve/2020/CVE-2020-10071.md

### [CVE-2020-10071](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-10071)
![](https://img.shields.io/static/v1?label=Product&message=zephyr&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=%3E%3D%202.2.0%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-120%20Buffer%20Overflow&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-129%20Improper%20Validation%20of%20Array%20Index&color=brighgreen)

### Description

The Zephyr MQTT parsing code performs insufficient checking of the length field on publish messages, allowing a buffer overflow and potentially remote code execution. NCC-ZEP-031 This issue affects: zephyrproject-rtos zephyr version 2.2.0 and later versions.

### POC

#### Reference
- https://research.nccgroup.com/2020/05/26/research-report-zephyr-and-mcuboot-security-assessment
- https://research.nccgroup.com/2020/05/26/research-report-zephyr-and-mcuboot-security-assessment
- https://zephyrprojectsec.atlassian.net/browse/ZEPSEC-86
- https://zephyrprojectsec.atlassian.net/browse/ZEPSEC-86

#### Github
No PoCs found on GitHub currently.