That’s a hard question to answer, although one would hope not. But there are vulnerabilities present in many hospital computers that could easily be accessed and exploited through internet providers in my area. The problem with hospital computers is that they are often run on very old versions of Windows. And because any upgrades or patches may warrant a resubmission to the FDA, many of these systems are never altered, leaving them wide open to attack.
At present, malware seems to be an issue in some wards. The software can significantly slow a system down, rendering it unable to properly record patient data. Help may be on the way for old hospital computer system, however. This issue was the topic of a recent panel discussion of an information security board just last week.