This document aims at explaining some recent vulnerabilities in Apache HTTP Server that leads to attacks like path traversal and remote code execution.
You can download it from the following link: https://packetstormsecurity.com/files/download/165089/CVE-2021-42013.pdf
Source: https://packetstormsecurity.com/files/165089/Apache-HTTP-Server-2.4.50-CVE-2021-42013-Exploitation.html