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.
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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.
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 19 days ago·verify at source
- 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
- 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
- eap8-jboss-el-api_5.0_spec-0:4.0.2-1.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 19 days ago·verify at source
Mitigation checklist
- 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 19 days ago·verify at source
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