CVEs-PoC/2021/CVE-2021-43803.md

### [CVE-2021-43803](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43803)
![](https://img.shields.io/static/v1?label=Product&message=next.js&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-20%3A%20Improper%20Input%20Validation&color=brighgreen)

### Description

Next.js is a React framework. In versions of Next.js prior to 12.0.5 or 11.1.3, invalid or malformed URLs could lead to a server crash. In order to be affected by this issue, the deployment must use Next.js versions above 11.1.0 and below 12.0.5, Node.js above 15.0.0, and next start or a custom server. Deployments on Vercel are not affected, along with similar environments where invalid requests are filtered before reaching Next.js. Versions 12.0.5 and 11.1.3 contain patches for this issue.

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/eeenvik1/scripts_for_YouTrack
- https://github.com/fkie-cad/nvd-json-data-feeds