CVEs-PoC/2021/CVE-2021-3566.md

### [CVE-2021-3566](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3566)
![](https://img.shields.io/static/v1?label=Product&message=ffmpeg&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=ffmpeg%204.3%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-200&color=brightgreen)

### Description

Prior to ffmpeg version 4.3, the tty demuxer did not have a 'read_probe' function assigned to it. By crafting a legitimate "ffconcat" file that references an image, followed by a file the triggers the tty demuxer, the contents of the second file will be copied into the output file verbatim (as long as the `-vcodec copy` option is passed to ffmpeg).

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/akaganeite/CVE4PP