Around two dozen U.S. government departments and federal agencies are being questioned by the U.S. Congress on whether they were using backdoored Juniper network security appliances.

In December, Juniper Networks announced that it had discovered unauthorized code added to ScreenOS, the operating system that runs on its NetScreen network firewalls. The rogue code, which remained undetected for 2 years or more, could have allowed remote attackers to gain administrative access to the vulnerable devices or to decrypt VPN connections.

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