There are multiple zero-day, remote code execution vulnerabilities that Apple has announced they will not be patching. 
- Apple Quicktime on Microsoft Windows platforms
- All users should remove Quicktime on Windows machines.
How to remove Quicktime on Windows:
Managed Berkeley Desktops with Self-Service have an offer to remove Quicktime on Windows, even if the user has non-admin privileges. Self-Service is available on non-Berkeley Desktops as well if a department has opted into the the service delivered via the BigFix platform and run by EEI. 
IST customers with Windows machines should coordinate with their service providers to ensure Quicktime is uninstalled on server assets.
Unmanaged Windows systems can follow Apple's instructions for removing Quicktime.