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).
https://www.cpsc.gov/Recalls/2022/Nautilus-Recalls-Treadmills-Due-to-Fall-Hazard
https://download.nautilus.com/pdf/NLS.T616-T618.cpsc.safety.notice.EN.pdf