This is not surprising:
This year, I bought two more machines to see if security had improved. To my dismay, I discovered that the newer model machines -- those that were used in the 2016 election -- are running Windows CE and have USB ports, along with other components, that make them even easier to exploit than the older ones. Our voting machines, billed as "next generation," and still in use today, are worse than they were before -- dispersed, disorganized, and susceptible to manipulation.
Cory Doctorow's comment is correct:
Voting machines are terrible in every way: the companies that make them lie like crazy about their security, insist on insecure designs, and produce machines that are so insecure that it's easier to hack a voting machine than it is to use it to vote.
I blame both the secrecy of the industry and the ignorance of most voting officials. And it's not getting better.