What is a Kill-Bit?

After booting up Windows XP I encountered an automatic update notification. During the progress I noticed an update named something like “…kill-bit ActiveX…” which I could not identify what was for and therefore looked it up.

The Kill-Bit appears to be something as simple as a registry entry to disable vulnerable ActiveX controls or COM objects so they can no longer be loaded in Internet Explorer or other applications based on the MSHTML rendering engine.

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