source: https://www.securityfocus.com/bid/1190/info
Sending a specially crafted URL containing malformed file extension information to Microsoft IIS 4.0/5.0 will consume CPU usage until it reaches 100% which will halt the program's services. Restarting the application or waiting until the URL is processed will be required in order to regain normal functionality.
https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/19907-1.exe
https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/19907.zip
