Why are software updates important? Vulnerabilities explained simply Link to heading

The “Update later” button is one of the most frequently clicked buttons in our digital lives. This is understandable, because updates interrupt our work, take time, and don’t seem to bring any visible changes. However, something quite different is happening in the background.

What is a vulnerability? Link to heading

All software contains bugs. Some of these are merely inconveniences, usually resulting in the program freezing or displaying something incorrectly. Other bugs, however, represent security vulnerabilities: an attacker can exploit them to gain access to the device, steal data, or run malicious code.

Vulnerabilities are not theoretical threats. They are regularly discovered in the most widely used software, browsers, operating systems, and office applications.

What happens when an update is released? Link to heading

When a security update is released, two things happen simultaneously:

  1. The vulnerability is fixed in the software that has been updated
  2. Details of the vulnerability are made public, so attackers also learn where the flaw was

This means that after an update is released, devices running the old version become easier targets. Attackers know exactly where to look for the vulnerability and know that older versions are vulnerable, so they target them.

Zero-day vulnerabilities Link to heading

It is particularly dangerous when a vulnerability is exploited before the manufacturer is even aware of it. This is called a zero-day vulnerability. In such cases, no patch is available, and only general caution can provide any protection for the user.

However, these vulnerabilities are rare, and exploiting them is expensive. They typically appear in targeted attacks, not in mass automated attacks. Most successful attacks exploit known, long-patched vulnerabilities on devices that haven’t been updated.

What does this apply to? Link to heading

Not just the operating system:

  • Web browser - the primary entry point to the internet, requiring constant updates
  • Browser extensions - often overlooked but actively exploited targets
  • Mobile apps - especially those that use a network connection
  • Router firmware - the gateway to your home network, rarely updated, yet critical
  • IoT devices - smart TVs, cameras, smart lights… Updates for these are often completely neglected

What should you do? Link to heading

  • Enable automatic updates for your operating system and browser
  • Regularly check your installed apps and uninstall any you don’t use
  • Look for the firmware update option in your router’s admin interface
  • Don’t use software that is no longer supported (e.g., Windows 10 after 2025)

Summary Link to heading

Updates aren’t always about new features. They often contain invisible security fixes. An unpatched device is a target riddled with known vulnerabilities. Enabling automatic updates is one of the most effortless yet effective steps you can take to protect yourself.

This article is part of a series designed to explain the basics of online security in simple terms.