When Tesla delivered its first Cybertruck during a livestreamed event last November, CEO Elon Musk made a point of talking about just how tough and “literally bulletproof” the electric pickup is, even showing a video of it being raked by gunfire. Rust, however, may be Cybertruck’s Achilles Heel. Reports by some members on Cybertruck owner forums indicate the panels on their trucks have begun showing corrosion. The extent of the problem is uncertain, as is the cause. But, if it proves to be more than a rare fluke it could cause serious problems for Tesla, as Headlight.News reports.