Pretty common and easy fix with a can of semi gloss or matte black paint and a small brush.
My 15 year old Magnum was the same when new. I touched that up then and it lasted until last year only because i replaced the upper control arms and the new ones rusted just the same until I painted them up again. The new Charger, same and holding up well.
After detailing and touchup:
View attachment 1631