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HTTP/2 'MadeYouReset' vulnerability enables DoS attacks

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📰 2 unique sources, 2 articles

Summary

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A new HTTP/2 vulnerability called 'MadeYouReset' allows attackers to bypass server-imposed limits on concurrent requests, enabling large-scale DoS attacks. The flaw affects multiple HTTP/2 implementations, including Apache Tomcat, F5 BIG-IP, and Netty. The vulnerability exploits the RST_STREAM frame to trigger server resets, leading to resource exhaustion and potential crashes. The issue has been assigned CVE-2025-8671, with specific CVEs for affected products. The attack bypasses existing mitigations for similar vulnerabilities, such as Rapid Reset and HTTP/2 CONTINUATION Flood. Researchers from Tel Aviv University identified the MadeYouReset technique and coordinated with over 100 vendors during the responsible disclosure process. Some vendors were already protected, while others have implemented fixes. The vulnerability could potentially affect up to one-third of all websites globally. Multiple vendors have acknowledged the vulnerability and are working on mitigations.

Timeline

  1. 14.08.2025 18:20 📰 2 articles · ⏱ 1mo ago

    HTTP/2 'MadeYouReset' vulnerability disclosed

    A new HTTP/2 vulnerability called 'MadeYouReset' has been disclosed, allowing attackers to bypass server-imposed limits on concurrent requests. The flaw affects multiple HTTP/2 implementations and exploits the RST_STREAM frame to trigger server resets, leading to resource exhaustion and potential crashes. The issue has been assigned CVE-2025-8671. Researchers from Tel Aviv University identified the MadeYouReset technique and coordinated with over 100 vendors during the responsible disclosure process. Some vendors were already protected, while others have implemented fixes. The vulnerability could potentially affect up to one-third of all websites globally.

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