cve/2021/CVE-2021-42380.md

### [CVE-2021-42380](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42380)
![](https://img.shields.io/static/v1?label=Product&message=busybox&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=%3C%201.34.0%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-416&color=brighgreen)

### Description

A use-after-free in Busybox's awk applet leads to denial of service and possibly code execution when processing a crafted awk pattern in the clrvar function

### POC

#### Reference
- https://claroty.com/team82/research/unboxing-busybox-14-vulnerabilities-uncovered-by-claroty-jfrog
- https://jfrog.com/blog/unboxing-busybox-14-new-vulnerabilities-uncovered-by-claroty-and-jfrog/

#### Github
- https://github.com/isgo-golgo13/gokit-gorillakit-enginesvc