A new alert has come through that warns of QuickTime vulnerabilities as Apple ends support for QuickTime.
For details, see the U.S. Department of Homeland Security’s release at: https://www.us-cert.gov/ncas/alerts/TA16-105A
At this point, it appears the only course of action to protect yourself is to uninstall QuickTime as the U.S. Department of Homeland Security suggests:
“The only mitigation available is to uninstall QuickTime for Windows. Users can find instructions for uninstalling QuickTime for Windows on the Apple Uninstall QuickTime page.”