&gt; Often there is no need to install updates at all on machines [...] like HVAC and SCADA systems<p>Which, incidentally, have been the target of a lot of recent high-profile attacks.[0][1][2][3]<p>[0] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Duqu#Purpose" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Duqu#Purpose</a><p>[1] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Stuxnet#PLC_infection" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Stuxnet#PLC_infection</a><p>[2] <a href="http:&#x2F;&#x2F;www.computerworld.com&#x2F;article&#x2F;2475789&#x2F;cybercrime-hacking&#x2F;hackers-exploit-scada-holes-to-take-full-control-of-critical-infrastructure.html" rel="nofollow">http:&#x2F;&#x2F;www.computerworld.com&#x2F;article&#x2F;2475789&#x2F;cybercrime-hack...</a><p>[3] <a href="http:&#x2F;&#x2F;krebsonsecurity.com&#x2F;2014&#x2F;02&#x2F;target-hackers-broke-in-via-hvac-company&#x2F;" rel="nofollow">http:&#x2F;&#x2F;krebsonsecurity.com&#x2F;2014&#x2F;02&#x2F;target-hackers-broke-in-v...</a>