The Guardian:
Russian intelligence agents hacked a US voting systems manufacturer in the weeks leading up to last year’s presidential election . . . Russian military intelligence carried out a cyber-attack on at least one US voting software supplier and sent spear-phishing emails to more than a hundred local election officials days before the poll. Although the document does not directly identify the company in question, it contains references to a product made by VR Systems, a Florida-based vendor of electronic voting services and equipment whose products are used in eight states.
There is still a great deal of uncertainty over how successful the Russian operatives were and does not reach a conclusion about whether it affected the outcome of the election. But the suggestion that Russian hackers may gained at least a foothold in electronic voting systems is likely to add even more pressure to special counsel and congressional investigations.
https://www.theguardian.com/technology/2017/jun/05/russia-us-election-hack-voting-system-nsa-report