Wired reporting on the Windows ransomware that’s wreaking havoc at the moment:

One reason WannaCry has proven so vicious? It seems to leverage a Windows vulnerability known as EternalBlue that allegedly originated with the NSA. The exploit was dumped into the wild last month in a trove of alleged NSA tools by the Shadow Brokers hacking group. Microsoft released a patch for the exploit, known as MS17-010, in March, but clearly many organizations haven’t caught up.

Even if this doesn’t originate from the NSA, it’s ample proof that no one should have backdoors.