In the US, vote-counting computers used in government elections contained a security vulnerability which could have been used to affect election results. The systems, which were sold by Elections Systems & Software (ES&S), contained remote-access software and were sold between 2000 and 2006, with some machines still being used as late as 2011.
Election-management systems are not voting terminals - they are in county election offices and contain software that in some counties is used to program all the voting machines used in the county. The systems also tabulate final results from voting machines.

The link for this article located at InfoSecurity is no longer available.