CVE-2025-9784

Undertow: undertow madeyoureset http/2 ddos vulnerability

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Attend

*SSVC

Descriptions

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).

Red Hat build of Apache Camel 4.14.2 for Spring Boot patch release and security update is now available.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:Attend

Exploitation

None

Automatable

Yes

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2025-09-01 CVE Reserved
2025-09-02 CVE Published
2026-05-06 CVE Updated
2026-05-08 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

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

CAPEC

References (17)

URL	Tag	Source
https://bugzilla.redhat.com/show_bug.cgi?id=2392306	Issue Tracking
https://github.com/undertow-io/undertow/pull/1778
https://issues.redhat.com/browse/UNDERTOW-2598
https://github.com/undertow-io/undertow/releases/tag/2.2.38.Final
https://kb.cert.org/vuls/id/767506

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://access.redhat.com/security/cve/CVE-2025-9784	2025-09-24
https://access.redhat.com/errata/RHSA-2025:23143	2026-05-06
https://access.redhat.com/errata/RHSA-2026:0383	2026-05-06
https://access.redhat.com/errata/RHSA-2026:0384	2026-05-06
https://access.redhat.com/errata/RHSA-2026:0386	2026-05-06
https://access.redhat.com/errata/RHSA-2026:3889	2026-05-06
https://access.redhat.com/errata/RHSA-2026:3891	2026-05-06
https://access.redhat.com/errata/RHSA-2026:3892	2026-05-06
https://access.redhat.com/errata/RHSA-2026:4915	2026-05-06
https://access.redhat.com/errata/RHSA-2026:4916	2026-05-06
https://access.redhat.com/errata/RHSA-2026:4917	2026-05-06
https://access.redhat.com/errata/RHSA-2026:4924	2026-05-06

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Redhat Search vendor "Redhat"		Build Of Apache Camel For Spring Boot Search vendor "Redhat" for product "Build Of Apache Camel For Spring Boot"				-		-		Affected
Redhat Search vendor "Redhat"		Fuse Search vendor "Redhat" for product "Fuse"				7.0.0 Search vendor "Redhat" for product "Fuse" and version "7.0.0"		-		Affected
Redhat Search vendor "Redhat"		Jboss Enterprise Application Platform Search vendor "Redhat" for product "Jboss Enterprise Application Platform"				7.0.0 Search vendor "Redhat" for product "Jboss Enterprise Application Platform" and version "7.0.0"		-		Affected
Redhat Search vendor "Redhat"		Jboss Enterprise Application Platform Search vendor "Redhat" for product "Jboss Enterprise Application Platform"				8.0.0 Search vendor "Redhat" for product "Jboss Enterprise Application Platform" and version "8.0.0"		-		Affected
Redhat Search vendor "Redhat"		Jboss Enterprise Application Platform Expansion Pack Search vendor "Redhat" for product "Jboss Enterprise Application Platform Expansion Pack"				-		-		Affected
Redhat Search vendor "Redhat"		Process Automation Search vendor "Redhat" for product "Process Automation"				7.0 Search vendor "Redhat" for product "Process Automation" and version "7.0"		-		Affected
Redhat Search vendor "Redhat"		Single Sign-on Search vendor "Redhat" for product "Single Sign-on"				7.0 Search vendor "Redhat" for product "Single Sign-on" and version "7.0"		-		Affected
Redhat Search vendor "Redhat"		Undertow Search vendor "Redhat" for product "Undertow"				-		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux"				8.0 Search vendor "Redhat" for product "Enterprise Linux" and version "8.0"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux"				9.0 Search vendor "Redhat" for product "Enterprise Linux" and version "9.0"		-		Affected