Established Fact
Election Systems & Software (ESS), the largest U.S. voting machine vendor, admitted in a 2018 letter to Senator Ron Wyden that it had installed pcAnywhere remote-access software on election management systems sold to Pennsylvania and other states between 2000 and 2006 – directly contradicting prior public representations that it had never done so. The period during which pcAnywhere was installed coincided with the theft of pcAnywhere’s source code by hackers, meaning that any ESS EMS with pcAnywhere installed was potentially accessible to anyone possessing the stolen source code. ESS refused to disclose to Congress which specific states and counties had received affected systems and refused to seek Colorado certification when the state required vulnerability test results to be made public.
Citations
Top Voting Machine Vendor Admits It Installed Remote-Access Software on Systems Sold to States: https://www.vice.com/en/article/top-voting-machine-vendor-admits-it-installed-remote-access-software-on-systems-sold-to-states/ | Vice Motherboard
Public Citizen Calls on Largest Voting Machine Vendor to Stop Selling Machines That Connect to the Internet: https://www.citizen.org/news/public-citizen-calls-on-largest-voting-machine-vendor-to-stop-selling-machines-that-connect-to-the-internet-increase-costs-to-taxpayers/ | Public Citizen
Voting machine vendor says it installed remote software connections: https://cyberscoop.com/es-s-voting-machine-remote-access-ron-wyden/ | CyberScoop