WannaCry Ransomware: What Businesses Need to Know

The WannaCry ransomware outbreak spread to hundreds of thousands of computers worldwide in a matter of days, hitting hospitals, shipping companies, and businesses of every size. Unlike most ransomware, it didn't rely on someone clicking a malicious link — it spread automatically between unpatched Windows machines over the network, using a vulnerability Microsoft had actually released a patch for two months earlier.

That's the core lesson: the patch existed before the outbreak. Machines that had simply applied routine Windows updates were protected. The businesses hit hardest were largely running older, unpatched, or unsupported versions of Windows.

If your organization doesn't have a reliable, monitored patch management process, this is the moment to put one in place. Waiting weeks or months to apply security updates leaves a widening window of exposure to vulnerabilities that are often already being actively exploited.