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In GAO's survey of 24 federal agencies, the 18 agencies having high-impact systems identified cyber attacks from “nations” as the most serious and most frequently-occurring threat to the security of their systems. These agencies also noted that attacks delivered through e-mail were the most serious and frequent. During fiscal year 2014, 11 of the 18 agencies reported 2,267 incidents affecting their high-impact systems, with almost 500 of the incidents involving the installation of malicious code.

Government entities have provided guidance and established initiatives and services to aid agencies in protecting their systems, including those categorized as high impact. The National Institute of Standards and Technology has prescribed federal standards for minimum security requirements and guidance on security and privacy controls for high-impact systems, including 83 controls specific to such systems. The Office of Management and Budget (OMB) is developing plans for shared services and practices for federal security operations centers but has not issued them yet. In addition, agencies reported that they are in the process of implementing various federal initiatives, such as tools to diagnose and mitigate intrusions on a continuous basis and stronger controls over access to agency networks.

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