Microsoft has released a new Intel Microcode update for Windows 10 1909, 1903, and older versions that contains software fixes for hardware bugs in Intel CPUs. Intel can fix, or at least mitigate, security flaws such as speculative execution vulnerabilities or bugs that are discovered after a CPU has been manufactured. With the latest update, the following additional processors receive mitigations for various security vulnerabilities and bugs. Microsoft will require you to restart your computer if you wish to install the update, so be sure to save any open documents before starting the update.
Source: https://www.bleepingcomputer.com/news/microsoft/new-intel-microcodes-for-windows-10-released-to-fix-cpu-bugs/