As per HN guidelines, &quot;please submit the original source&quot;. The posted article&#x27;s source is this article from The Guardian:<p><a href="http:&#x2F;&#x2F;www.theguardian.com&#x2F;technology&#x2F;2016&#x2F;jan&#x2F;16&#x2F;trident-old-technology-brave-new-world-cyber-warfare" rel="nofollow">http:&#x2F;&#x2F;www.theguardian.com&#x2F;technology&#x2F;2016&#x2F;jan&#x2F;16&#x2F;trident-ol...</a><p><i>&quot;Microsoft ended security updates for Windows XP in 2014, meaning that the Vanguard submarines could be vulnerable to viruses, malware, and cyberattacks.&quot;</i><p>I&#x27;m pretty sure that the systems that are running these subs aren&#x27;t being used to surf the web. They&#x27;re probably not even networked with any systems outside the navy, so it&#x27;s not likely that they&#x27;d be exposed to malware. I&#x27;d also guess that mission-critical systems are not physically exposed in such a way that a random sailor could plug a USB stick into them - the CPUs are probably inside locked compartments with highly restricted access.