how to stop command execution in command prompt windows 10

CTRL+C will send a break (stop execution) when no text is selected. Try it ;-)

Reference

I had the same thing happening with Ctrl+C not stopping the Tracert process. However Ctrl+Pause/Break did.

This was on Windows 10 build 1709 with updates current as of 06-27-2018. I suspect whatever is going on will be machine specific for some odd reason.

best way seems (thanks to @LPChip):

CTRL+ Break(pause)