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RTFA yourself: The 5800 cited already are connected to the Internet.
In order to monitor these systems remotely, many operators use a TCP/IP card or a third-party serial port server to map the ATG serial interface to an internet-facing TCP port. The most common configuration is to map these to TCP port 10001. Although some systems have the capability to password protect the serial interfaces, this is not commonly implemented.
Approximately 5,800 ATGs were found to be exposed to the internet without a password. Over 5,300 of these ATGs are located in the United States, which works out to about 3 percent of the approximately 150,000  fueling stations in the country.
I'm just irritated that someone somewhere thought it was necessary to say TCP/IP card as opposed to network card.