It helps if you tell us where you are. After that, the more information you can give about what has been going on, what you have tried, etc, the more help we can be. Not sure what you are worried about in the first picture. Viburnums do get fall color.
The second picture clearly is some kind of leaf spot disease, which are usually fungal. In viburnum these are usually not serious. It will be dropping those leaves soon anyway. Be sure you rake up and destroy the leaves (not in compost pile), which will help prevent it from coming back next year. For prevention, mulching helps, and keeping the leaves dry (water only the soil, not the leaves).