CVE-2025-9784Undertow: undertow madeyoureset http/2 ddos vulnerability

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).

Timeline

Scores

EPSS (exploitation in 30 days)

2.3% · top 16% of all CVEs (12 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: yes · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.

Affected products

• undertow

  • affected < 2.2.38.Final

• Red Hat · Red Hat build of Apache Camel 4.14.2 for Spring Boot 3.5.8

  All versions: unaffected

• Red Hat · Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7

  • unaffected 0:1.4.18-21.SP19_redhat_00001.1.ep7.el7 – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7

  • unaffected 0:2.0.41-8.SP9_redhat_00001.1.el7eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 7.4.24

  • unaffected 2.2.39.Final-redhat-00001 – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7

  • unaffected 0:2.2.39-1.Final_redhat_00001.1.el7eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7

  • unaffected 0:7.4.24-4.GA_redhat_00002.1.el7eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8

  • unaffected 0:2.2.39-1.Final_redhat_00001.1.el8eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8

  • unaffected 0:7.4.24-4.GA_redhat_00002.1.el8eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9

  • unaffected 0:2.2.39-1.Final_redhat_00001.1.el9eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9

  • unaffected 0:7.4.24-4.GA_redhat_00002.1.el9eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.0

  All versions: unaffected

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8

  • unaffected 0:1.83.0-1.redhat_00001.1.el8eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8

  • unaffected 0:33.0.0-2.jre_redhat_00003.1.el8eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8

  • unaffected 0:4.0.6-1.redhat_00001.1.el8eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8

  • unaffected 0:1.0.0-3.redhat_00009.1.el8eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8

  • unaffected 0:2.0.2-1.Final_redhat_00001.1.el8eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8

  • unaffected 0:2.3.23-1.SP3_redhat_00001.1.el8eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9

  • unaffected 0:1.83.0-1.redhat_00001.1.el9eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9

  • unaffected 0:33.0.0-2.jre_redhat_00003.1.el9eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9

  • unaffected 0:4.0.6-1.redhat_00001.1.el9eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9

  • unaffected 0:1.0.0-3.redhat_00009.1.el9eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9

  • unaffected 0:2.0.2-1.Final_redhat_00001.1.el9eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9

  • unaffected 0:2.3.23-1.SP3_redhat_00001.1.el9eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.1.3

  • unaffected 2.3.20.SP4-redhat-00001 – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

  • unaffected 0:4.0.10-1.redhat_00001.1.el8eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

  • unaffected 0:1.82.0-1.redhat_00001.1.el8eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

  • unaffected 0:801.3.0-1.GA_redhat_00001.1.el8eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

  • unaffected 0:1.0.1-3.redhat_00003.1.el8eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

  • unaffected 0:6.6.36-1.Final_redhat_00001.1.el8eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

  • unaffected 0:4.0.2-1.Final_redhat_00001.1.el8eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

  • unaffected 0:2.5.0-1.redhat_00001.1.el8eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

  • unaffected 0:2.3.20-2.SP4_redhat_00001.1.el8eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

  • unaffected 0:8.1.3-4.GA_redhat_00006.1.el8eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

  • unaffected 0:5.0.12-1.Final_redhat_00001.1.el8eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

  • unaffected 0:2.6.6-1.Final_redhat_00001.1.el8eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8

  • unaffected 0:8.1.1-4.GA_redhat_00007.1.el8eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

  • unaffected 0:4.0.10-1.redhat_00001.1.el9eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

  • unaffected 0:1.82.0-1.redhat_00001.1.el9eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

  • unaffected 0:801.3.0-1.GA_redhat_00001.1.el9eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

  • unaffected 0:1.0.1-3.redhat_00003.1.el9eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

  • unaffected 0:6.6.36-1.Final_redhat_00001.1.el9eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

  • unaffected 0:4.0.2-1.Final_redhat_00001.1.el9eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

  • unaffected 0:2.5.0-1.redhat_00001.1.el9eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

  • unaffected 0:2.3.20-2.SP4_redhat_00001.1.el9eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

  • unaffected 0:8.1.3-4.GA_redhat_00006.1.el9eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

  • unaffected 0:5.0.12-1.Final_redhat_00001.1.el9eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

  • unaffected 0:2.6.6-1.Final_redhat_00001.1.el9eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9

  • unaffected 0:8.1.1-4.GA_redhat_00007.1.el9eap – < *

• Red Hat · Red Hat Single Sign-On 7.6.13

  All versions: unaffected

• Red Hat · Red Hat Single Sign-On 7.6 for RHEL 7

  • unaffected 0:18.0.20-1.redhat_00001.1.el7sso – < *

• Red Hat · Red Hat Single Sign-On 7.6 for RHEL 8

  • unaffected 0:18.0.20-1.redhat_00001.1.el8sso – < *

• Red Hat · Red Hat Single Sign-On 7.6 for RHEL 9

  • unaffected 0:18.0.20-1.redhat_00001.1.el9sso – < *

• Red Hat · RHEL-8 based Middleware Containers

  • unaffected 7.6-85 – < *

• Red Hat · Red Hat build of Apache Camel - HawtIO 4

  All versions: unaffected

• Red Hat · Red Hat Data Grid 8

  All versions: affected

• Red Hat · Red Hat Enterprise Linux 10

  All versions: unaffected

• Red Hat · Red Hat Enterprise Linux 8

  All versions: unaffected

• Red Hat · Red Hat Enterprise Linux 8

  All versions: unaffected

• Red Hat · Red Hat Enterprise Linux 9

  All versions: unaffected

• Red Hat · Red Hat Fuse 7

  All versions: affected

• Red Hat · Red Hat JBoss Enterprise Application Platform 7

  All versions: affected

• Red Hat · Red Hat JBoss Enterprise Application Platform 8

  All versions: unaffected

• Red Hat · Red Hat JBoss Enterprise Application Platform 8

  All versions: unaffected

• Red Hat · Red Hat JBoss Enterprise Application Platform Expansion Pack

  All versions: affected

• Red Hat · Red Hat JBoss Enterprise Application Platform Expansion Pack

  All versions: unaffected

• Red Hat · Red Hat Process Automation 7

  All versions: affected

Affected packages

From reviewed advisories of the GitHub Advisory Database.

• Mavenio.undertow:undertow-coreGHSA-95h4-w6j8-2rp8 (opens in a new tab)

What to do

Workaround: No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• EUVD EUVD-2025-26388 (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisory GHSA-95h4-w6j8-2rp8 (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2025-9784](https://cveledger.app/badge/CVE-2025-9784.svg)](https://cveledger.app/cve/CVE-2025-9784)

Record last updated 4 Nov 2026, 21:46 UTC.