The WannaCry attacks have taught security pros a lot about the dangers of cyber blackmail. Patch, patch, patch and patch management overhadow everything, and this attack campaign shows us why. The rapid spread of the worm was made possible by the ubiquity of systems worldwide running on unsupported or unpatched operating systems. Many medical devices are built on top of old Windows operating systems that are notoriously difficult to update due to government regulations and the organizations’ own concerns about causing system disruptions during updates.”]
Source: https://www.darkreading.com/attacks-breaches/5-security-lessons-wannacry-taught-us-the-hard-way