Georgia Election System Server May Have Been Compromised Through Shellshock in 2014
Evidence suggests that an election system server in the US state of George was vulnerable to the Shellshock flaw for several months in 2014, and that the server was compromised through the vulnerability.
While much of the attention on election systems has been on vote recording, history suggests that problems are more likely to occur in the backend tabulation and reporting systems.
William Hugh Murray
Computers can be hacked; voting machines are computers. Computers connected to the Internet have a greater chance of being hacked, voting machines are, (sometimes), connected to the Internet. https://qz.com/1783766/these-voting-machine-security-flaws-threaten-election-2020/
States are increasingly turning to National Guard cyber forces. https://www.thenewstribune.com/news/politics-government/article239319613.html