CVE-2025-9784

Undertow: undertow madeyoureset http/2 ddos vulnerability

State: Published
Severity: 7.5 High
Published: Sep 2, 2025
Updated: Oct 14, 2026
Reserved: Sep 1, 2025

Description

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).

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	redhat

Weaknesses

CWE-770 Allocation of Resources Without Limits or Throttling
CWE-404 Improper Resource Shutdown or Release

Affected Products

Product	Versions
undertow	before 2.2.38.FinalAffected
Red Hat build of Apache Camel 4.14.2 for Spring Boot 3.5.8Red Hat
Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7Red Hat	0:1.4.18-21.SP19_redhat_00001.1.ep7.el7 and laterNot affected
Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7Red Hat	0:2.0.41-8.SP9_redhat_00001.1.el7eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 7.4.24Red Hat	2.2.39.Final-redhat-00001 and laterNot affected
Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7Red Hat	0:2.2.39-1.Final_redhat_00001.1.el7eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7Red Hat	0:7.4.24-4.GA_redhat_00002.1.el7eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8Red Hat	0:2.2.39-1.Final_redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8Red Hat	0:7.4.24-4.GA_redhat_00002.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9Red Hat	0:2.2.39-1.Final_redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9Red Hat	0:7.4.24-4.GA_redhat_00002.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.0Red Hat
Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8Red Hat	0:1.83.0-1.redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8Red Hat	0:33.0.0-2.jre_redhat_00003.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8Red Hat	0:4.0.6-1.redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8Red Hat	0:1.0.0-3.redhat_00009.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8Red Hat	0:2.0.2-1.Final_redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8Red Hat	0:2.3.23-1.SP3_redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9Red Hat	0:1.83.0-1.redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9Red Hat	0:33.0.0-2.jre_redhat_00003.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9Red Hat	0:4.0.6-1.redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9Red Hat	0:1.0.0-3.redhat_00009.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9Red Hat	0:2.0.2-1.Final_redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9Red Hat	0:2.3.23-1.SP3_redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1.3Red Hat	2.3.20.SP4-redhat-00001 and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:4.0.10-1.redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:1.82.0-1.redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:801.3.0-1.GA_redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:1.0.1-3.redhat_00003.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:6.6.36-1.Final_redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:4.0.2-1.Final_redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:2.5.0-1.redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:2.3.20-2.SP4_redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:8.1.3-4.GA_redhat_00006.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:5.0.12-1.Final_redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:2.6.6-1.Final_redhat_00001.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Red Hat	0:8.1.1-4.GA_redhat_00007.1.el8eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:4.0.10-1.redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:1.82.0-1.redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:801.3.0-1.GA_redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:1.0.1-3.redhat_00003.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:6.6.36-1.Final_redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:4.0.2-1.Final_redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:2.5.0-1.redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:2.3.20-2.SP4_redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:8.1.3-4.GA_redhat_00006.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:5.0.12-1.Final_redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:2.6.6-1.Final_redhat_00001.1.el9eap and laterNot affected
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Red Hat	0:8.1.1-4.GA_redhat_00007.1.el9eap and laterNot affected
Red Hat Single Sign-On 7.6.13Red Hat
Red Hat Single Sign-On 7.6 for RHEL 7Red Hat	0:18.0.20-1.redhat_00001.1.el7sso and laterNot affected
Red Hat Single Sign-On 7.6 for RHEL 8Red Hat	0:18.0.20-1.redhat_00001.1.el8sso and laterNot affected
Red Hat Single Sign-On 7.6 for RHEL 9Red Hat	0:18.0.20-1.redhat_00001.1.el9sso and laterNot affected
RHEL-8 based Middleware ContainersRed Hat	7.6-85 and laterNot affected
Red Hat build of Apache Camel - HawtIO 4Red Hat
Red Hat Data Grid 8Red Hat
Red Hat Enterprise Linux 10Red Hat
Red Hat Enterprise Linux 8Red Hat
Red Hat Enterprise Linux 8Red Hat
Red Hat Enterprise Linux 9Red Hat
Red Hat Fuse 7Red Hat
Red Hat JBoss Enterprise Application Platform 7Red Hat
Red Hat JBoss Enterprise Application Platform 8Red Hat
Red Hat JBoss Enterprise Application Platform 8Red Hat
Red Hat JBoss Enterprise Application Platform Expansion PackRed Hat
Red Hat JBoss Enterprise Application Platform Expansion PackRed Hat
Red Hat Process Automation 7Red Hat

References

RHSA-2025:23143vendor-advisory
RHSA-2026:0383vendor-advisory
RHSA-2026:0384vendor-advisory
RHSA-2026:0386vendor-advisory
RHSA-2026:33371vendor-advisory
RHSA-2026:33372vendor-advisory
RHSA-2026:3889vendor-advisory
RHSA-2026:3891vendor-advisory
RHSA-2026:3892vendor-advisory
RHSA-2026:4915vendor-advisory
RHSA-2026:4916vendor-advisory
RHSA-2026:4917vendor-advisory
RHSA-2026:4924vendor-advisory
RHSA-2026:76128vendor-advisory
RHSA-2026:76129vendor-advisory
RHSA-2026:76130vendor-advisory
RHSA-2026:76132vendor-advisory
RHSA-2026:76134vendor-advisory
https://access.redhat.com/security/cve/CVE-2025-9784vdb-entry
RHBZ#2392306issue-tracking
https://github.com/undertow-io/undertow/pull/1778
https://github.com/undertow-io/undertow/releases/tag/2.2.38.Final
https://issues.redhat.com/browse/UNDERTOW-2598
https://kb.cert.org/vuls/id/767506
https://www.kb.cert.org/vuls/id/767506

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