Existing critical vulnerabilities as well as vulnerabilities that will arise in the future will soon be cannon-fodder for hackers who will probably be itching to exploit them. While Apple has advised users of QuickTime and QuickTime Pro to uninstall the software from their Windows devices as soon as possible, users of QuickTime for Mac OS X can continue to use the service as Apple continues to protect it.
Trend Micro, who are advising users of QuickTime for Windows to uninstall the software, said that while existing vulnerabilities have so far not been exploited, there is a big chance that they will and users should uninstall QuickTime before such situations arise.
"However, even with protections, ultimately the right answer is to follow Apple’s guidance and uninstall QuickTime for Windows. That is the only sure way to be protected against all current and future vulnerabilities in the product now that Apple is no longer providing security updates for it," said Trend Micro.
The US Department of Homeland Security has also issued an advisory concerning existing and possible vulnerabilities of QuickTime, saying that "computer systems running unsupported software are exposed to elevated cybersecurity dangers, such as increased risks of malicious attacks or electronic data loss. Exploitation of QuickTime for Windows vulnerabilities could allow remote attackers to take control of affected systems."
Apple has published guidelines on how to remove or uninstall QuickTime from your Windows device to keep your computer protected. You can find these guidelines here.