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CVE-2025-9784: Undertow MadeYouReset HTTP/2 DDoS Vulnerability

September 2, 2025

A flaw was found in Undertow where malformed client requests can trigger server-side stream resets without triggering abuse counters. This issue, referred to as the “MadeYouReset” attack, allows malicious clients to induce excessive server workload by repeatedly causing server-side stream aborts. While not a protocol bug, this highlights a common implementation weakness that can be exploited to cause a denial of service (DoS).

References

  • access.redhat.com/security/cve/CVE-2025-9784
  • bugzilla.redhat.com/show_bug.cgi?id=2392306
  • github.com/advisories/GHSA-95h4-w6j8-2rp8
  • github.com/undertow-io/undertow
  • nvd.nist.gov/vuln/detail/CVE-2025-9784

Code Behaviors & Features

Detect and mitigate CVE-2025-9784 with GitLab Dependency Scanning

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Affected versions

All versions up to 2.3.18.Final

Solution

Unfortunately, there is no solution available yet.

Impact 7.5 HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Learn more about CVSS

Weakness

  • CWE-404: Improper Resource Shutdown or Release

Source file

maven/io.undertow/undertow-core/CVE-2025-9784.yml

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