cve/2021/CVE-2021-42071.md

### [CVE-2021-42071](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42071)
![](https://img.shields.io/static/v1?label=Product&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=brighgreen)

### Description

In Visual Tools DVR VX16 4.2.28.0, an unauthenticated attacker can achieve remote command execution via shell metacharacters in the cgi-bin/slogin/login.py User-Agent HTTP header.

### POC

#### Reference
- https://www.exploit-db.com/exploits/50098
- https://www.swascan.com/security-advisory-visual-tools-dvr-cve-2021-42071/

#### Github
- https://github.com/ARPSyndicate/cvemon
- https://github.com/ARPSyndicate/kenzer-templates
- https://github.com/nomi-sec/PoC-in-GitHub