cve/2021/CVE-2021-42911.md

### [CVE-2021-42911](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42911)
![](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

A Format String vulnerability exists in DrayTek Vigor 2960 <= 1.5.1.3, DrayTek Vigor 3900 <= 1.5.1.3, and DrayTek Vigor 300B <= 1.5.1.3 in the mainfunction.cgi file via a crafted HTTP message containing malformed QUERY STRING, which could let a remote malicious user execute arbitrary code.

### POC

#### Reference
- https://gist.github.com/Cossack9989/e9c1c2d2e69b773ca4251acdd77f2835

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