CVEs-PoC/2020/CVE-2020-21677.md

### [CVE-2020-21677](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-21677)
![](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 heap-based buffer overflow in the sixel_encoder_output_without_macro function in encoder.c of Libsixel 1.8.4 allows attackers to cause a denial of service (DOS) via converting a crafted PNG file into Sixel format.

### POC

#### Reference
- https://github.com/saitoha/libsixel/issues/123

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