NBC:

[A] team of election security experts say that last summer, they discovered some systems are, in fact, online.

“We found over 35 [voting systems] had been left online and we’re still continuing to find more,” Kevin Skoglund, a senior technical advisor at the election security advocacy group National Election Defense Coalition, told NBC News…..

The National Institute of Standards and Technology, which provides cybersecurity frameworks for state and local governments and other organizations, recommends that voting systems should not have wireless network connections.

All the systems Skoglund’s group found online were manufactured by ES&S. The online systems were found in 11 states, in at least some precincts, as well as in the District of Columbia. The states were: Florida, Wisconsin, Michigan, Rhode Island, Illinois, Indiana. Kentucky, Minnesota, Massachusetts, Nebraska and Mississippi