Try this solution, originally courtesy of user malowz, repeated by user John Cline in this thread:
I think you'll be very pleased with the result.
Try adding this FX chain:
Invert > Levels > Invert
Then go to the Levels FX and adjust the gamma slider. This will tame the overexposed whites without affecting the mid and dark tones. If this doesn't work, it is likely that the image was so overexposed that it clipped and there is no information to be retrieved.