Last week, the US Department of Homeland Security issued a security notice warning that "an attacker with a low skill would be able to exploit these vulnerabilities" using known weaknesses that exist in older Windows software.
The Siemens spokesman said no evidence of any attack had been found.
Siemens' action provides more evidence of a growing focus on preventing cyber-attacks on medical equipment, which for years ranked low on the list of potential hacking targets.
The vulnerabilities identified by Siemens were in its PET (positron emission tomography) scanners that run on Microsoft Windows 7, which could be exploited remotely.
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