Surviving the Storm: How Uploadcare Navigates the HTTP/2 Vulnerability Behind Record-Breaking DDoS Attacks

The new zero-day vulnerability in the HTTP/2 protocol, known as HTTP/2 Rapid Reset, has already led to a surge in hyper-volumetric DDoS attacks. Major players like Cloudflare, Google, Microsoft, and Amazon claim that these attacks have far exceeded previous records. While HTTP/3 is lurking on the horizon as a long-term solution, let’s talk about what this means right now, specifically for Uploadcare users.

For Whom the Bell Tolls

For anyone who uses file management or content delivery systems, any new HTTP/2 vulnerability is not just an abstract problem. Let’s understand what HTTP/2 weakness these attacks exploit and whether Uploadcare users are protected. The exploited vulnerability in HTTP/2 targets the ability to handle multiple simultaneous requests, a feature integral to efficient web operations. Given the scale of the recent attacks, the robustness and reliability of services relying on HTTP/2 are under scrutiny.

The Anatomy of the HTTP/2 Vulnerability

The vulnerability in HTTP/2, dubbed HTTP/2 Rapid Reset, opens a gateway for substantial DDoS attacks. At its core, HTTP/2 was designed to improve upon its predecessor by allowing multiple requests over a single connection, thereby enhancing web performance. However, this feature became the attack vector.

In a typical scenario, the protocol handles multiple simultaneous requests efficiently. The vulnerability allowed attackers to initiate an automated cycle of sending and immediately canceling a high volume of requests. This led to an overwhelming load on servers that implemented HTTP/2, effectively taking them offline.

In the context of file management and CDN services, such as those provided by Uploadcare, the impact is profound. These systems rely on the efficient routing and processing of multiple file requests—be it uploads, transformations, or retrievals. An attack exploiting this vulnerability could not only degrade performance but also compromise the reliability of the content delivery network.

Does This Vulnerability Affect Uploadcare Users?

Uploadcare has a resilient distributed infrastructure and collaborates with trusted partners such as Akamai and AWS. They promptly responded to the identified vulnerability and mitigated the risk.

We strive to ensure a secure and reliable service. The only effective way to protect is to identify vulnerabilities as early as possible to take immediate action. To achieve this, Uploadcare monitors security bulletins.


The emergence of the “HTTP/2 Rapid Reset” vulnerability has placed renewed emphasis on the need for robust security measures in file management and content delivery services. A resilient architecture and reliable partners help Uploadcare mitigate such risks. While HTTP/3 looms as a more secure and efficient alternative for the future, the present demands vigilance and adaptability. By choosing a secure, managed file service like Uploadcare, you’re not just opting for efficiency and ease-of-use; you’re investing in resilience and reliability.

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