Inside Cybersecurity reports that the “greatest cyber risks to U.S. national security involve about a third of the country’s 16 critical infrastructure sectors.”  

“The bureau’s cybersecurity outreach program for critical infrastructure is focused on six sectors – banking and finance, energy, transportation, information technology, communications and public health – the program’s leader, Stacy Stevens, said during a June 9 public meeting of cybersecurity professionals … The FBI official’s comments, as well as documents obtained by Inside Cybersecurity under the Freedom of Information Act, shed new light on how U.S. authorities view cyber risks in industry, a subject shrouded in secrecy that some argue is excessive.”  

“It omits the names of the specific sectors and infrastructure deemed most vulnerable, but reveals that a DHS working group identified ’61 entities in five critical infrastructure sectors where a cybersecurity incident could reasonably result in catastrophic regional or national effects on public health or safety, economic security, or national security.'”