If you are using the default "All" channel policy, then your configuration is affected. If you have a channel policy which only allows the use of the terminal (drawing channel), then your configuration is not affected.
If you wish to create a new channel policy which is not affected, but uses multiple channels, make sure that the *Custom* channel type is not allowed!
It is recommended to install the patches on the target systems released by Microsoft as soon as you can.
It is also generally recommended to use Network Level Authentication when possible, because that can prevent this issue from happening in real life.