CVEs-PoC/2021/CVE-2021-33439.md

### [CVE-2021-33439](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-33439)
![](https://img.shields.io/static/v1?label=Product&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=brightgreen)

### Description

An issue was discovered in mjs (mJS: Restricted JavaScript engine), ES6 (JavaScript version 6). There is Integer overflow in gc_compact_strings() in mjs.c.

### POC

#### Reference
- https://gist.github.com/Clingto/bb632c0c463f4b2c97e4f65f751c5e6d
- https://github.com/cesanta/mjs/issues/159

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