Biggest Outages in History

On July 19, 2024, CrowdStrike experienced a significant outage that impacted multiple sectors globally, including airlines, banking, and media. The issue stemmed from a faulty update to CrowdStrike's Falcon sensor configuration for Windows systems, leading to widespread IT disruptions. This incident also affected Microsoft's Azure cloud platform, further exacerbating the problem. CrowdStrike promptly addressed the issue by deploying a fix, but the outage highlighted the vulnerabilities in interconnected IT systems and the critical need for robust update management processes.

There have been other major IT outages in history, including:

• Google Outage (December 14, 2020) On December 14, 2020, Google experienced an outage that lasted 45 minutes but had a widespread impact. This incident took down essential Google services, including Gmail, Google Drive, YouTube, and Google Maps. The cause was an internal storage quota issue that prevented Google’s authentication system from releasing additional storage space, leading to a system crash. The financial impact was significant, with Google losing an estimated $1.7 million in ad revenue during the YouTube downtime.
• Amazon Web Services (AWS) Outage (February 28, 2017) AWS, one of the largest cloud service providers, faced a major outage on February 28, 2017. The outage originated from the US-East-1 region and was caused by human error during a debugging session, leading to high error rates and the partial or full unavailability of services like Quora, Business Insider, and Slack. The outage underscored the risks of relying on a single region for critical services.
• Dyn DNS Attack (October 21, 2016) On October 21, 2016, Dyn, a major DNS provider, was hit by one of the largest distributed denial-of-service (DDoS) attacks in history. The attack leveraged vulnerabilities in Internet of Things (IoT) devices, such as IP cameras and printers, to overwhelm Dyn’s servers. This caused major websites, including Twitter, Spotify, and Netflix, to go offline for several hours. The attack highlighted the vulnerabilities in the growing number of connected devices and the significant impact such attacks can have on internet infrastructure.
• British Airways IT Failure (May 27, 2017) British Airways experienced a severe IT outage on May 27, 2017, due to an IT maintenance contractor accidentally switching off the power supply to a data center. The outage resulted in the grounding of over 1,000 flights, affecting 75,000 passengers and causing significant disruption at Heathrow and Gatwick airports. The financial cost to British Airways was estimated at $102 million, factoring in compensation to passengers and lost revenue.
• Fastly CDN Outage (June 8, 2021) Fastly, a content delivery network (CDN) provider, suffered a major outage on June 8, 2021, due to a faulty configuration push. The outage made thousands of high-profile websites, including news sites and social media platforms, unreachable for about an hour. Despite the short duration, the incident demonstrated the fragility of web infrastructure and the cascading effects a CDN outage can have on global internet accessibility.

These incidents underscore the importance of robust IT infrastructure and contingency planning to mitigate the risks and impacts of unexpected outages. Organizations must continuously assess and improve their systems to ensure resilience against such disruptions.