cve/2018/CVE-2018-13305.md

### [CVE-2018-13305](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-13305)
![](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 FFmpeg 4.0.1, due to a missing check for negative values of the mquant variable, the vc1_put_blocks_clamped function in libavcodec/vc1_block.c may trigger an out-of-array access while converting a crafted AVI file to MPEG4, leading to an information disclosure or a denial of service.

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/aflsmart/aflsmart
- https://github.com/andir/nixos-issue-db-example