On December 5, 2025, a significant outage impacted numerous websites and online services due to a change made by Cloudflare, an Internet service provider claiming to support 20 percent of the web. This disruption was reported shortly before 9 AM, leading many users to encounter empty pages and '500 Internal Server Error' messages when trying to access sites such as LinkedIn, Zoom, and Shopify, among others. The disruption lasted until approximately 9:20 AM, when the issues were resolved. Cloudflare attributed the outage to a modification in its Web Application Firewall, specifically related to how it parses requests. A company representative clarified that the incident was not associated with a cyberattack, but rather a preventive measure against a recently identified security vulnerability in the React Server Components library. This vulnerability was disclosed earlier in the week, which allowed for potential unauthenticated remote code execution. The incident marks the second major outage for Cloudflare in less than a month. A previous outage in November was linked to an internal error concerning changes to database permissions. Such incidents raise concerns among cybersecurity professionals regarding the 'concentration risk' tied to reliance on a few major providers for online infrastructure. Experts suggest that businesses should assess their dependency on single providers and consider multi-setup solutions to mitigate risks of future outages. In light of these repeated disruptions, industry thought leaders emphasize that the growing complexity of internet infrastructure leads to an increased concentration of power among a few key players, such as Cloudflare. As many users may view an outage as an isolated incident, it is crucial to understand its broader implications for internet traffic management and the resilience of web services. Businesses must prepare for systemic failures with robust contingency plans to ensure continuity in service delivery.