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CVE-2025-9784

Undertow: undertow madeyoureset http/2 ddos vulnerability

HIGH
7.5
CVSS Score
Published: September 2, 2025 at 01:37 PM UTC
Updated: October 14, 2026 at 05:17 PM UTC
11 products affected across 2 vendorsEnterprise LinuxJBoss Enterprise Application PlatformSingle Sign on

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Severity
HIGH7.5
Exploit prediction
EPSS 2%
SSVC
No known exploit

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).

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Apache Camel for Spring Boot· Red Hatrpm
95%
All versions4.14
Vendor states this is fixed in 4.14 (unaffected)
Enterprise Linux· Red Hatrpm
95%
8.09.0
Vendor states this is fixed in 10 (unaffected)
Vendor states this is fixed in 8 (unaffected)
Vendor states this is fixed in 9 (unaffected)
Fuse· Red Hatrpm
95%
7.0.0
JBoss Enterprise Application Platform· Red Hatrpm
95%
7.0.08.0.0
Vendor states this is fixed in 0:1.0.0-3.redhat_00009.1.el8eap (unaffected)
Vendor states this is fixed in 0:1.0.0-3.redhat_00009.1.el9eap (unaffected)
Vendor states this is fixed in 0:1.0.1-3.redhat_00003.1.el8eap (unaffected)
Vendor states this is fixed in 0:1.0.1-3.redhat_00003.1.el9eap (unaffected)
Vendor states this is fixed in 0:1.4.18-21.SP19_redhat_00001.1.ep7.el7 (unaffected)
Vendor states this is fixed in 0:1.82.0-1.redhat_00001.1.el8eap (unaffected)
Vendor states this is fixed in 0:1.82.0-1.redhat_00001.1.el9eap (unaffected)
Vendor states this is fixed in 0:1.83.0-1.redhat_00001.1.el8eap (unaffected)
Vendor states this is fixed in 0:1.83.0-1.redhat_00001.1.el9eap (unaffected)
Vendor states this is fixed in 0:2.0.2-1.Final_redhat_00001.1.el8eap (unaffected)
Vendor states this is fixed in 0:2.0.2-1.Final_redhat_00001.1.el9eap (unaffected)
Vendor states this is fixed in 0:2.0.41-8.SP9_redhat_00001.1.el7eap (unaffected)
Vendor states this is fixed in 0:2.2.39-1.Final_redhat_00001.1.el7eap (unaffected)
Vendor states this is fixed in 0:2.2.39-1.Final_redhat_00001.1.el8eap (unaffected)
Vendor states this is fixed in 0:2.2.39-1.Final_redhat_00001.1.el9eap (unaffected)
Vendor states this is fixed in 0:2.3.20-2.SP4_redhat_00001.1.el8eap (unaffected)
Vendor states this is fixed in 0:2.3.20-2.SP4_redhat_00001.1.el9eap (unaffected)
Vendor states this is fixed in 0:2.3.23-1.SP3_redhat_00001.1.el8eap (unaffected)
Vendor states this is fixed in 0:2.3.23-1.SP3_redhat_00001.1.el9eap (unaffected)
Vendor states this is fixed in 0:2.5.0-1.redhat_00001.1.el8eap (unaffected)
Vendor states this is fixed in 0:2.5.0-1.redhat_00001.1.el9eap (unaffected)
Vendor states this is fixed in 0:2.6.6-1.Final_redhat_00001.1.el8eap (unaffected)
Vendor states this is fixed in 0:2.6.6-1.Final_redhat_00001.1.el9eap (unaffected)
Vendor states this is fixed in 0:33.0.0-2.jre_redhat_00003.1.el8eap (unaffected)
Vendor states this is fixed in 0:33.0.0-2.jre_redhat_00003.1.el9eap (unaffected)
Vendor states this is fixed in 0:4.0.10-1.redhat_00001.1.el8eap (unaffected)
Vendor states this is fixed in 0:4.0.10-1.redhat_00001.1.el9eap (unaffected)
Vendor states this is fixed in 0:4.0.2-1.Final_redhat_00001.1.el8eap (unaffected)
Vendor states this is fixed in 0:4.0.2-1.Final_redhat_00001.1.el9eap (unaffected)
Vendor states this is fixed in 0:4.0.6-1.redhat_00001.1.el8eap (unaffected)
Vendor states this is fixed in 0:4.0.6-1.redhat_00001.1.el9eap (unaffected)
Vendor states this is fixed in 0:5.0.12-1.Final_redhat_00001.1.el8eap (unaffected)
Vendor states this is fixed in 0:5.0.12-1.Final_redhat_00001.1.el9eap (unaffected)
Vendor states this is fixed in 0:6.6.36-1.Final_redhat_00001.1.el8eap (unaffected)
Vendor states this is fixed in 0:6.6.36-1.Final_redhat_00001.1.el9eap (unaffected)
Vendor states this is fixed in 0:7.4.24-4.GA_redhat_00002.1.el7eap (unaffected)
Vendor states this is fixed in 0:7.4.24-4.GA_redhat_00002.1.el8eap (unaffected)
Vendor states this is fixed in 0:7.4.24-4.GA_redhat_00002.1.el9eap (unaffected)
Vendor states this is fixed in 0:8.1.1-4.GA_redhat_00007.1.el8eap (unaffected)
Vendor states this is fixed in 0:8.1.1-4.GA_redhat_00007.1.el9eap (unaffected)
Vendor states this is fixed in 0:8.1.3-4.GA_redhat_00006.1.el8eap (unaffected)
Vendor states this is fixed in 0:8.1.3-4.GA_redhat_00006.1.el9eap (unaffected)
Vendor states this is fixed in 0:801.3.0-1.GA_redhat_00001.1.el8eap (unaffected)
Vendor states this is fixed in 0:801.3.0-1.GA_redhat_00001.1.el9eap (unaffected)
Vendor states this is fixed in 2.2.39.Final-redhat-00001 (unaffected)
Vendor states this is fixed in 2.2.39.Final-redhat-1 (unaffected)
Vendor states this is fixed in 2.3.24.SP2-redhat-1 (unaffected)
Vendor states this is fixed in 8.0 (unaffected)
JBoss Enterprise Application Platform Expansion Pack· Red Hatrpm
95%
All versions
Process Automation· Red Hatrpm
95%
7.0
Single Sign on· Red Hatrpm
95%
7.0
Vendor states this is fixed in 0:18.0.20-1.redhat_00001.1.el7sso (unaffected)
Vendor states this is fixed in 0:18.0.20-1.redhat_00001.1.el8sso (unaffected)
Vendor states this is fixed in 0:18.0.20-1.redhat_00001.1.el9sso (unaffected)
Undertow· Red Hat
95%
All versions
Build of Apache Camel - HawtIO· Red Hatrpm
90%
All versions
Vendor states this is fixed in 4 (unaffected)
Data Grid· Red Hatrpm
90%
All versions8

References (25)

VDB Entryx_refsource_REDHATVendor Advisory
Source: [email protected]
https://access.redhat.com/security/cve/CVE-2025-9784
Issue Trackingx_refsource_REDHAT
Source: [email protected]
https://bugzilla.redhat.com/show_bug.cgi?id=2392306
Source: cverecord
https://github.com/undertow-io/undertow/pull/1778
Source: cverecord
https://issues.redhat.com/browse/UNDERTOW-2598
Source: cverecord
https://github.com/undertow-io/undertow/releases/tag/2.2.38.Final
Source: cverecord
https://kb.cert.org/vuls/id/767506
Vendor Advisoryx_refsource_REDHAT
Source: cverecord
https://access.redhat.com/errata/RHSA-2025:23143
Vendor Advisoryx_refsource_REDHAT
Source: cverecord
https://access.redhat.com/errata/RHSA-2026:0384

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHredhat
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-404CWE-770

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