There are always bound to be bugs in software. Sometimes these issues aren’t that big, but sometimes they can be dangerous. Take for example a recent Windows WiFi vulnerability that Microsoft disclosed.

#CoSoSec

This vulnerability wasn't originally publicly disclosed, and is now patched with an up-to-date Windows install, but the incident highlights the necessity of installing critical security patches in a timely manner.

https://www.xda-developers.com/windows-wi-fi-vulnerability/