Topmusicanswers
It could be a loose fret, too much bow or backbow on the neck. It could even be a string slot cut too low at the nut that might sound like it's originating at the bridge. The string could be improperly seated in the pin hole and is caught too high against the pin and not on the bridge plate.
How do you fix bridge fret buzz?
When you experience all or most of the strings buzzing when played open, then it is likely the neck is back bowed (there's not enough relief). The strings are buzzing against the first fret. The fix is simple: increase the amount of relief in the neck by loosening the truss rod.
