I ran into the same problem and the only way I was able to open the CMD as administrator from CMD was doing the following:
Open CMD
Write powershell -Command “Start-Process cmd -Verb RunAs” and press Enter
A pop-up window will appear asking to open a CMD as administrator
I don’t have enough reputation to add a comment to the top answer, but with the power of aliases you can get away with just typing the following:
powershell “start cmd -v runAs”
This is just a shorter version of user3018703 excellent
solution:
powershell -Command “Start-Process cmd -Verb RunAs”