In May, Microsoft released a patch for a bug in several versions of Windows that is so bad that the company felt it even had to release a fix for Windows XP, an operating system that has been unsupported for five years.
That vulnerability is known as BlueKeep, and it has kept a lot of security researchers up at night. They are worried that someone could write an exploit for it and make a worm that could wreak havoc the way WannaCry or NotPetya—two viruses that spread almost uncontrollably all over the world locking thousands of computers— did. BlueKeep is
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