Rapid7’s National Exposure Index shows 10 million Telnet devices with open Telnet ports connected to the Internet as we speak. The report also reveals the most exposed country in the world, with Zimbabwe, Hong Kong, Samoa, Congo, Tajikistan, Romania, Ireland, Lithuania, Australia, and Estonia. The US ranked #134 on the list of most exposed countries, followed by Zimbabwe, Samoa and Congo. The top 10 is made up by the top 10 countries, including the US, Zimbabwe and Samoa.
Source: https://www.bleepingcomputer.com/news/security/botnet-fodder-10-million-devices-with-open-telnet-ports-still-available-online/