IIS 5.0 allows remote attackers to execute arbitrary commands via a malformed request for an executable file whose name is appended with operating system commands, aka the "Web Server File Request Parsing" vulnerability.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A191
https://exchange.xforce.ibmcloud.com/vulnerabilities/5470
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2000/ms00-086