The SQL Slammer worm, a computer worm that exploited a vulnerability in Microsoft SQL Server, caused a major internet disruption in 2003. It spread rapidly, overwhelming network resources and causing significant problems. This worm's impact demonstrated the potential for widespread damage from vulnerabilities in software, especially when combined with a lack of security updates. The worm's rapid spread was due to the vulnerability's design, allowing for quick propagation across networks. This incident underscored the importance of timely security patches and robust network security measures. The SQL Slammer worm's impact was felt globally, highlighting the interconnected nature of the internet and the potential for widespread disruption from malicious code. It's a crucial example of how a seemingly minor vulnerability can have devastating consequences if not addressed promptly.