What is UPnP? Yes, It's Still Dangerous in 2021 | UpGuard
UPnP (Universal Plug and Play) is a service that allows devices on the same local network to discover each other and automatically connect through standard networking protocols (such as TCP/IP HTTP, and DHCP). Some examples of UPnP devices are printers, gaming consoles, WiFi devices, IP cameras, routers, mobile devices, and Smart TVs.