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CVE-2025-9784

Undertow: undertow madeyoureset http/2 ddos vulnerability

Published: Sep 2, 2025Updated: Mar 5, 2026 Sources: CVE List NVD GHSACWE-770
NVD MITRE
7.5CVSSHIGH
EPSS Score
2.2%
Top 20.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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).

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-770CWE-404

Affected Products

Red Hat build of Apache Camel 4.14.2 for Spring Boot 3.5.8Red Hat
On-prem
Operating Systems / linux-distro
Red Hat JBoss Enterprise Application PlatformRed Hat
On-prem
Operating Systems / linux-distro
Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7Red Hat
On-prem
Operating Systems / linux-distro
Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8Red Hat
On-prem
Operating Systems / linux-distro
red hatcommercialUSOperating Systemsaka red hat
and 27 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available
Workaround Available

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://access.redhat.com/errata/RHSA-2025:23143
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:0383
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:0384
access.redhat.com
and 21 more references View all →

Timeline

Published
Sep 2, 2025
Last Updated
Mar 5, 2026

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