Why is the Log4j cybersecurity flaw the ‘most serious’ in decades?

A cybersecurity flaw in the popular Log4j software, part of the Java programming language, is affecting a significant portion of the internet, including sectors like healthcare, military, Google and Amazon. The flaw, described as the most significant vulnerability in decades, potentially allows hackers to control systems with a simple line of code. Most hacking attempts to date have aimed to install cryptocurrency mining software on victims’ computers, while some involve breaches of government and business systems. Tech companies and government agencies are now working to fix the vulnerability.