Nautilus treadmills T616 S/N 100672PRO21140001 through 100672PRO21171980 and T618 S/N 100647PRO21130111 through 100647PRO21183960 with software before 2022-06-09 allow physically proximate attackers to cause a denial of service (fall) by connecting the power cord to a 120V circuit (which may lead to self-starting at an inopportune time).