https://www.bleepingcomputer.com/news/microsoft/windows-10-intel-microcode-released-to-fix-new-cpu-security-bugs/

Microsoft has released a new batch of Intel microcode updates for Windows 10 20H2, 2004, 1909, and older versions to fix new hardware vulnerabilities discovered in Intel CPUs.

When Intel finds bugs in their CPUs, they release microcode updates that allow operating systems to patch the behavior of the CPU to fix, or at least mitigate, the bug.