### [CVE-2021-33193](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-33193)
![](https://img.shields.io/static/v1?label=Product&message=Apache%20HTTP%20Server&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=Apache%20HTTP%20Server%202.4%202.4.17%20to%202.4.48%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=Request%20Splitting&color=brightgreen)

### Description

A crafted method sent through HTTP/2 will bypass validation and be forwarded by mod_proxy, which can lead to request splitting or cache poisoning. This issue affects Apache HTTP Server 2.4.17 to 2.4.48.

### POC

#### Reference
- https://portswigger.net/research/http2
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://www.oracle.com/security-alerts/cpujan2022.html

#### Github
- https://github.com/20142995/nuclei-templates
- https://github.com/ARPSyndicate/cvemon
- https://github.com/CHYbeta/OddProxyDemo
- https://github.com/NeoOniX/5ATTACK
- https://github.com/PierreChrd/py-projet-tut
- https://github.com/Samaritin/OSINT
- https://github.com/Totes5706/TotesHTB
- https://github.com/austin-lai/External-Penetration-Testing-Holo-Corporate-Network-TryHackMe-Holo-Network
- https://github.com/bioly230/THM_Skynet
- https://github.com/cyb3r-w0lf/nuclei-template-collection
- https://github.com/jkiala2/Projet_etude_M1
- https://github.com/n0-traces/cve_monitor
- https://github.com/nomi-sec/PoC-in-GitHub
- https://github.com/soosmile/POC