Researchers are warning that more than 20 models of a Chinese-made router contain a software "backdoor" that could allow foreign access and possible connections to other devices on a network. According to Reuters, cybersecurity firm VulnCheck says the backdoor, known as "Endlessdoors," ships in multiple models of routers made by Chinese company Zbtlink, under both Zbtlink and Wiflyer brands. Zptlink operates as a subsidiary of Chinese manufacturer Shenzhen Zhibotong Electronics, which builds routers and then white-labels them to be sold under other brands. Wiflyer is known as a budget brand for internet routers and mobile hotspots, selling primarily on third-party platforms like Amazon and Alibaba. The Federal Communications Commission banned all new foreign-made internet routers in late March.