The U.S. government is reportedly investigating newly discovered “unauthorized code” in the firmware that runs NetScreen firewalls built by technology giant Juniper Networks. The code was somehow added to the firmware in 2012, allowing an attacker to remotely gain access to any vulnerable device as well as decrypt VPN traffic flowing across the device. White House officials – speaking off the record – have reportedly suggested that a nation state is the most likely suspect behind this hack. The White House official likened the code implantation to “stealing a master key to get into any government building””]
Source: https://www.govinfosecurity.com/who-backdoored-junipers-code-a-8763