Beth Israel Deaconess has been outspoken   about the risks of malware on FDA 510k  approved medical devices such as radiology workstations, echocardiogram machines, and patient monitors. Although these devices appear to be “appliances” that you simply plug into the network and use for patient care, they are actually sophisticated computers, often running outdated versions of operating systems and applications that are not resilient against purposeful attacks. For example, we have devices from a major manufacturer that internally use Windows NT as the operating system and Apache 1.0 as the web server.

Continued here:
The Security Risks of Medical Devices