CVEs-PoC/2021/CVE-2021-20220.md

### [CVE-2021-20220](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-20220)
![](https://img.shields.io/static/v1?label=Product&message=undertow&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-444&color=brighgreen)

### Description

A flaw was found in Undertow. A regression in the fix for CVE-2020-10687 was found. HTTP request smuggling related to CVE-2017-2666 is possible against HTTP/1.x and HTTP/2 due to permitting invalid characters in an HTTP request. This flaw allows an attacker to poison a web-cache, perform an XSS attack, or obtain sensitive information from request other than their own. The highest threat from this vulnerability is to data confidentiality and integrity.

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/ARPSyndicate/cvemon
- https://github.com/brandonshiyay/learn-v8