Not totally boned. Unless the other screws got stripped too...Check the other two!
I'd first check an see if you maybe got lucky. Sometimes there will be a little more thread left in the hole.
A longer screw will bite and will hold with blue lock tite. If you don't have experience /tools for remaking threads
might be better left to a pro. Check close that all screws are the right length and pitch or even metric! I've have found before
where someone had lost a screw mid oil change and forced a 1/4" bolt into a hole meant for 6mm. I wouldn't dally on getting that fixed
Check out "Death of the Mayflower" in Admiral's posts to see a hazard of an oil leak.