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A new HTTP/2 vulnerability, CVE-2025-8671 (MadeYouReset), was recently disclosed on August 13, 2025. This attack leverages carefully crafted protocol frames to force servers into repeatedly resetting streams on a single connection, which can lead to high resource consumption and denial of service (DoS) in extreme cases. MadeYouReset and Rapid Reset (CVE-2023-44487) are two similar attack patterns exploiting HTTP/2 steam resets feature leading to resource exhaustion.
Stronger Defense with Azure Application Gateway
If you are using Azure Application Gateway, you are already protected against MadeYouReset vulnerability. Two years ago in 2023, when addressing the Rapid Reset (CVE-2023-44487) attack, our engineering team implemented a comprehensive mitigation for these streams reset types of attacks. We introduced stronger safeguards to account for all kinds of stream cancellation regardless of the reason to protect against different flavors of rapid reset attacks.
Customer Impact
These safeguards are already active in Azure Application Gateway. No customer action is required. Azure services remain secure and resilient against this new class of HTTP/2 protocol attacks.