This is claimed by the Dutch daily newspaper NRC Handelsblad in a report. The information comes from documents leaked by whistleblower and former NSA employee Edward Snowden.
According to the report, the NSA must have implemented special code on devices used in over 50,000 different networks on the Internet. In addition, the NSA is said to have intercepted 20 major hubs on the Internet that handle traffic between different continents.
In August, the US daily Washington Post reported that the NSA has special attack tools used to implement code in routers and firewalls on the Internet.
According to the Washington Post, the code implemented in these devices must remain even if the software in the devices is updated and can be used for interception and intrusion into individual networks. The number of units exposed is estimated to reach 85,000 before the end of 2013.