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Advisory severityHigh7.5Red Hat Linux

High [CVE-2025-9784] undertow madeyoureset http/2 ddos vulnerability

This high-severity Red Hat Linux advisory covers CVE-2025-9784 affecting Red Hat build of Apache Camel 4.14.2 for Spring Boot 3.5.8, Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7, Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2025-9784 Source published Source updated

VulniPulse record published

CVE-2025-9784
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

Summary

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). This vulnerability is rated with an Important severity.

It is simple to exploit because it does not require authentication and could result in a Denial of Service (DoS). While some DoS flaws are classified as Moderate, “MadeYouReset” is Important because of the limited barriers (no specialized tooling or advanced scripting) to exploitation, which directly impacts service availability.

Since these resets consume CPU and memory resources and can be generated at scale over a single TCP/TLS connection, a remote attacker could exhaust server capacity quickly, impacting all legitimate clients. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

Weakness: CWE-770.

Is CVE-2025-9784 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2025-9784 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2025-9784?

Upgrade to a fixed release named by Red Hat:

  • 2.2.38.Final
  • undertow-core
  • eap7-undertow-0:1.4.18-21.SP19_redhat_00001.1.ep7.el7
  • eap7-undertow-0:2.0.41-8.SP9_redhat_00001.1.el7eap
  • io.undertow/undertow-core:2.2.39.Final-redhat-00001
  • eap7-undertow-0:2.2.39-1.Final_redhat_00001.1.el7eap
  • eap7-wildfly-0:7.4.24-4.GA_redhat_00002.1.el7eap
  • eap7-undertow-0:2.2.39-1.Final_redhat_00001.1.el8eap
  • eap7-wildfly-0:7.4.24-4.GA_redhat_00002.1.el8eap
  • eap7-undertow-0:2.2.39-1.Final_redhat_00001.1.el9eap
  • eap7-wildfly-0:7.4.24-4.GA_redhat_00002.1.el9eap
  • eap8-bouncycastle-0:1.83.0-1.redhat_00001.1.el8eap

38 more fixed releases are listed below.

Confirm against the vendor advisory before you patch.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.

Official advisory · high-confidence parse· fetched 15 days ago·verify at source

Fixed versions
  • 2.2.38.Final
  • undertow-core
  • eap7-undertow-0:1.4.18-21.SP19_redhat_00001.1.ep7.el7
  • eap7-undertow-0:2.0.41-8.SP9_redhat_00001.1.el7eap
  • io.undertow/undertow-core:2.2.39.Final-redhat-00001
  • eap7-undertow-0:2.2.39-1.Final_redhat_00001.1.el7eap
  • eap7-wildfly-0:7.4.24-4.GA_redhat_00002.1.el7eap
  • eap7-undertow-0:2.2.39-1.Final_redhat_00001.1.el8eap
  • eap7-wildfly-0:7.4.24-4.GA_redhat_00002.1.el8eap
  • eap7-undertow-0:2.2.39-1.Final_redhat_00001.1.el9eap
  • eap7-wildfly-0:7.4.24-4.GA_redhat_00002.1.el9eap
  • eap8-bouncycastle-0:1.83.0-1.redhat_00001.1.el8eap
  • eap8-guava-libraries-0:33.0.0-2.jre_redhat_00003.1.el8eap
  • eap8-jaxb-0:4.0.6-1.redhat_00001.1.el8eap
  • eap8-jcip-annotations-0:1.0.0-3.redhat_00009.1.el8eap
  • eap8-slf4j-jboss-logmanager-0:2.0.2-1.Final_redhat_00001.1.el8eap
  • eap8-undertow-0:2.3.23-1.SP3_redhat_00001.1.el8eap
  • eap8-bouncycastle-0:1.83.0-1.redhat_00001.1.el9eap
  • eap8-guava-libraries-0:33.0.0-2.jre_redhat_00003.1.el9eap
  • eap8-jaxb-0:4.0.6-1.redhat_00001.1.el9eap
  • eap8-jcip-annotations-0:1.0.0-3.redhat_00009.1.el9eap
  • eap8-slf4j-jboss-logmanager-0:2.0.2-1.Final_redhat_00001.1.el9eap
  • eap8-undertow-0:2.3.23-1.SP3_redhat_00001.1.el9eap
  • io.undertow/undertow-core:2.3.20.SP4-redhat-00001
  • eap8-apache-cxf-0:4.0.10-1.redhat_00001.1.el8eap
  • eap8-bouncycastle-0:1.82.0-1.redhat_00001.1.el8eap
  • eap8-eap-product-conf-parent-0:801.3.0-1.GA_redhat_00001.1.el8eap
  • eap8-eventstream-0:1.0.1-3.redhat_00003.1.el8eap
  • eap8-hibernate-0:6.6.36-1.Final_redhat_00001.1.el8eap
  • eap8-jboss-el-api_5.0_spec-0:4.0.2-1.Final_redhat_00001.1.el8eap
  • eap8-jboss-threads-0:2.5.0-1.redhat_00001.1.el8eap
  • eap8-undertow-0:2.3.20-2.SP4_redhat_00001.1.el8eap
  • eap8-wildfly-0:8.1.3-4.GA_redhat_00006.1.el8eap
  • eap8-wildfly-clustering-0:5.0.12-1.Final_redhat_00001.1.el8eap
  • eap8-wildfly-elytron-0:2.6.6-1.Final_redhat_00001.1.el8eap
  • eap8-wildfly-javadocs-0:8.1.1-4.GA_redhat_00007.1.el8eap
  • eap8-apache-cxf-0:4.0.10-1.redhat_00001.1.el9eap
  • eap8-bouncycastle-0:1.82.0-1.redhat_00001.1.el9eap
  • eap8-eap-product-conf-parent-0:801.3.0-1.GA_redhat_00001.1.el9eap
  • eap8-eventstream-0:1.0.1-3.redhat_00003.1.el9eap
  • eap8-hibernate-0:6.6.36-1.Final_redhat_00001.1.el9eap
  • RHSA-2025:23143
  • RHSA-2026:33372
  • RHSA-2026:33371
  • RHSA-2026:4924
  • RHSA-2026:4915
  • RHSA-2026:4916
  • RHSA-2026:4917
  • RHSA-2026:3892
  • RHSA-2026:3889

Official advisory · high-confidence parse· fetched 15 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.

Official advisory · high-confidence parse· fetched 15 days ago·verify at source

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