Security researchers and malicious hackers alike found Flash to be a prime target for attack. The vulnerabilities in version 12 were so severe that they often allowed an attacker to take complete control of the victim's machine.
Unlike the Netscape Plugin Application Programming Interface (NPAPI) used by Firefox, or the Pepper Plugin API (PPAPI) later adopted by Chrome, the ActiveX version of Flash Player 12 was built specifically for Windows operating systems and Internet Explorer. adobe flash player 12 activex
As planned, support for Adobe Flash Player ended on . In the following months, Microsoft released the KB4577586 update to remove the ActiveX version of Flash Player from Windows entirely. By January 12, 2021, Adobe began blocking Flash content from running, strongly recommending that all users uninstall the plugin immediately for their own system's security. The official download pages were also taken offline, signaling the final chapter for this once-essential web technology. Security researchers and malicious hackers alike found Flash
If you are running a critical legacy internal business application that requires Flash ActiveX, standard Windows internet security best practices dictate that you should treat the machine as air-gapped (disconnected from the internet) or within a highly restricted network zone. As planned, support for Adobe Flash Player ended on
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Unlike the NPAPI plugin (for Firefox/Safari), the ActiveX control has deeper system privileges. This is both a blessing (for complex enterprise apps) and a curse (for security).