cve/2021/CVE-2021-39517.md

### [CVE-2021-39517](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-39517)
![](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

An issue was discovered in libjpeg through 2020021. A NULL pointer dereference exists in the function BlockBitmapRequester::ReconstructUnsampled() located in blockbitmaprequester.cpp. It allows an attacker to cause Denial of Service.

### POC

#### Reference
- https://github.com/thorfdbg/libjpeg/issues/33

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