Public vulnerability disclosure
CVE-2025-9784
Undertow: undertow madeyoureset http/2 ddos vulnerability
publishedCWE-770CWE-404
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).
Technical severity7.5 highCVSS 3.1 · CNA: redhat
Published2025-09-02Source updated 2026-11-04
Collected2026-11-042 attributed sources
Fixes and workarounds
Workaround
No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.
Source: CNA: redhatAffected products and versions
| Product | Versions | Authority |
|---|---|---|
undertow
https://github.com/undertow-io/undertow/ |
≥ 0; < 2.2.38.Final (affected, semver)
Other versions: unaffected |
CNA: redhat |
| Red Hat build of Apache Camel 4.14.2 for Spring Boot 3.5.8 Red Hat undertow-core
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: unaffected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7 Red Hat eap7-undertow
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:1.4.18-21.SP19_redhat_00001.1.ep7.el7; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7 Red Hat eap7-undertow
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:2.0.41-8.SP9_redhat_00001.1.el7eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 7.4.24 Red Hat io.undertow/undertow-core
https://access.redhat.com/downloads/content/package-browser/ |
≥ 2.2.39.Final-redhat-00001; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 Red Hat eap7-undertow
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:2.2.39-1.Final_redhat_00001.1.el7eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 Red Hat eap7-wildfly
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:7.4.24-4.GA_redhat_00002.1.el7eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8 Red Hat eap7-undertow
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:2.2.39-1.Final_redhat_00001.1.el8eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8 Red Hat eap7-wildfly
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:7.4.24-4.GA_redhat_00002.1.el8eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9 Red Hat eap7-undertow
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:2.2.39-1.Final_redhat_00001.1.el9eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9 Red Hat eap7-wildfly
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:7.4.24-4.GA_redhat_00002.1.el9eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8.0 Red Hat undertow-core
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: unaffected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8 Red Hat eap8-bouncycastle
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:1.83.0-1.redhat_00001.1.el8eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8 Red Hat eap8-guava-libraries
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:33.0.0-2.jre_redhat_00003.1.el8eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8 Red Hat eap8-jaxb
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:4.0.6-1.redhat_00001.1.el8eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8 Red Hat eap8-jcip-annotations
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:1.0.0-3.redhat_00009.1.el8eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8 Red Hat eap8-slf4j-jboss-logmanager
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:2.0.2-1.Final_redhat_00001.1.el8eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8 Red Hat eap8-undertow
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:2.3.23-1.SP3_redhat_00001.1.el8eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9 Red Hat eap8-bouncycastle
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:1.83.0-1.redhat_00001.1.el9eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9 Red Hat eap8-guava-libraries
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:33.0.0-2.jre_redhat_00003.1.el9eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9 Red Hat eap8-jaxb
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:4.0.6-1.redhat_00001.1.el9eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9 Red Hat eap8-jcip-annotations
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:1.0.0-3.redhat_00009.1.el9eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9 Red Hat eap8-slf4j-jboss-logmanager
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:2.0.2-1.Final_redhat_00001.1.el9eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9 Red Hat eap8-undertow
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:2.3.23-1.SP3_redhat_00001.1.el9eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8.1.3 Red Hat io.undertow/undertow-core
https://access.redhat.com/downloads/content/package-browser/ |
≥ 2.3.20.SP4-redhat-00001; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 Red Hat eap8-apache-cxf
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:4.0.10-1.redhat_00001.1.el8eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 Red Hat eap8-bouncycastle
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:1.82.0-1.redhat_00001.1.el8eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 Red Hat eap8-eap-product-conf-parent
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:801.3.0-1.GA_redhat_00001.1.el8eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 Red Hat eap8-eventstream
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:1.0.1-3.redhat_00003.1.el8eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 Red Hat eap8-hibernate
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:6.6.36-1.Final_redhat_00001.1.el8eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 Red Hat eap8-jboss-el-api_5.0_spec
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:4.0.2-1.Final_redhat_00001.1.el8eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 Red Hat eap8-jboss-threads
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:2.5.0-1.redhat_00001.1.el8eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 Red Hat eap8-undertow
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:2.3.20-2.SP4_redhat_00001.1.el8eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 Red Hat eap8-wildfly
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:8.1.3-4.GA_redhat_00006.1.el8eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 Red Hat eap8-wildfly-clustering
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:5.0.12-1.Final_redhat_00001.1.el8eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 Red Hat eap8-wildfly-elytron
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:2.6.6-1.Final_redhat_00001.1.el8eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 Red Hat eap8-wildfly-javadocs
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:8.1.1-4.GA_redhat_00007.1.el8eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 Red Hat eap8-apache-cxf
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:4.0.10-1.redhat_00001.1.el9eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 Red Hat eap8-bouncycastle
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:1.82.0-1.redhat_00001.1.el9eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 Red Hat eap8-eap-product-conf-parent
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:801.3.0-1.GA_redhat_00001.1.el9eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 Red Hat eap8-eventstream
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:1.0.1-3.redhat_00003.1.el9eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 Red Hat eap8-hibernate
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:6.6.36-1.Final_redhat_00001.1.el9eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 Red Hat eap8-jboss-el-api_5.0_spec
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:4.0.2-1.Final_redhat_00001.1.el9eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 Red Hat eap8-jboss-threads
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:2.5.0-1.redhat_00001.1.el9eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 Red Hat eap8-undertow
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:2.3.20-2.SP4_redhat_00001.1.el9eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 Red Hat eap8-wildfly
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:8.1.3-4.GA_redhat_00006.1.el9eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 Red Hat eap8-wildfly-clustering
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:5.0.12-1.Final_redhat_00001.1.el9eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 Red Hat eap8-wildfly-elytron
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:2.6.6-1.Final_redhat_00001.1.el9eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 Red Hat eap8-wildfly-javadocs
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:8.1.1-4.GA_redhat_00007.1.el9eap; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Single Sign-On 7.6.13 Red Hat undertow-core
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: unaffected |
CNA: redhat |
| Red Hat Single Sign-On 7.6 for RHEL 7 Red Hat rh-sso7-keycloak
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:18.0.20-1.redhat_00001.1.el7sso; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Single Sign-On 7.6 for RHEL 8 Red Hat rh-sso7-keycloak
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:18.0.20-1.redhat_00001.1.el8sso; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Single Sign-On 7.6 for RHEL 9 Red Hat rh-sso7-keycloak
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:18.0.20-1.redhat_00001.1.el9sso; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| RHEL-8 based Middleware Containers Red Hat rh-sso-7/sso76-openshift-rhel8
https://catalog.redhat.com/software/containers/ |
≥ 7.6-85; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat build of Apache Camel - HawtIO 4 Red Hat undertow-core
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: unaffected |
CNA: redhat |
| Red Hat Data Grid 8 Red Hat undertow-core
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 10 Red Hat moditect
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: unaffected |
CNA: redhat |
| Red Hat Enterprise Linux 8 Red Hat pki-core:10.6/resteasy
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: unaffected |
CNA: redhat |
| Red Hat Enterprise Linux 8 Red Hat pki-deps:10.6/resteasy
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: unaffected |
CNA: redhat |
| Red Hat Enterprise Linux 9 Red Hat resteasy
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: unaffected |
CNA: redhat |
| Red Hat Fuse 7 Red Hat undertow-core
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 7 Red Hat undertow-core
https://access.redhat.com/jbossnetwork/restricted/listSoftware.html |
Range not reported
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8 Red Hat org.jberet-jberet-parent
https://access.redhat.com/jbossnetwork/restricted/listSoftware.html |
Range not reported
Other versions: unaffected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform 8 Red Hat org.jboss.eap-jboss-eap-xp
https://access.redhat.com/jbossnetwork/restricted/listSoftware.html |
Range not reported
Other versions: unaffected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform Expansion Pack Red Hat org.jboss.eap-jboss-eap-xp
https://access.redhat.com/jbossnetwork/restricted/listSoftware.html |
Range not reported
Other versions: affected |
CNA: redhat |
| Red Hat JBoss Enterprise Application Platform Expansion Pack Red Hat undertow-core
https://access.redhat.com/jbossnetwork/restricted/listSoftware.html |
Range not reported
Other versions: unaffected |
CNA: redhat |
| Red Hat Process Automation 7 Red Hat undertow-core
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: affected |
CNA: redhat |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 7.5 high |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CNA: redhat |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://access.redhat.com/errata/RHSA-2025:23143CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:0383CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:0384CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:0386CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:33371CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:33372CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:3889CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:3891CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:3892CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:4915CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:4916CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:4917CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:4924CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:76128CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:76129CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:76130CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:76132CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:76134CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2025-9784CNA: redhat · vdb-entry, x_refsource_REDHAT
- https://bugzilla.redhat.com/show_bug.cgi?id=2392306CNA: redhat · issue-tracking, x_refsource_REDHAT
- https://github.com/undertow-io/undertow/pull/1778CNA: redhat
- https://github.com/undertow-io/undertow/releases/tag/2.2.38.FinalCNA: redhat
- https://issues.redhat.com/browse/UNDERTOW-2598CNA: redhat
- https://kb.cert.org/vuls/id/767506CNA: redhat
- https://www.kb.cert.org/vuls/id/767506ADP: CVE
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