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

Status: published. Published: 2025-09-02. Updated: 2026-11-04.

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).

## Remediation

- workaround: No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability. (source: CNA: redhat)

## Affected products and versions

-  /  (undertow): ≥ 0; < 2.2.38.Final (affected, semver). Source: CNA: redhat
- Red Hat / Red Hat build of Apache Camel 4.14.2 for Spring Boot 3.5.8 (undertow-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7 (eap7-undertow): ≥ 0:1.4.18-21.SP19_redhat_00001.1.ep7.el7; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7 (eap7-undertow): ≥ 0:2.0.41-8.SP9_redhat_00001.1.el7eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 7.4.24 (io.undertow/undertow-core): ≥ 2.2.39.Final-redhat-00001; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 (eap7-undertow): ≥ 0:2.2.39-1.Final_redhat_00001.1.el7eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 (eap7-wildfly): ≥ 0:7.4.24-4.GA_redhat_00002.1.el7eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8 (eap7-undertow): ≥ 0:2.2.39-1.Final_redhat_00001.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8 (eap7-wildfly): ≥ 0:7.4.24-4.GA_redhat_00002.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9 (eap7-undertow): ≥ 0:2.2.39-1.Final_redhat_00001.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9 (eap7-wildfly): ≥ 0:7.4.24-4.GA_redhat_00002.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 (undertow-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8 (eap8-bouncycastle): ≥ 0:1.83.0-1.redhat_00001.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8 (eap8-guava-libraries): ≥ 0:33.0.0-2.jre_redhat_00003.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8 (eap8-jaxb): ≥ 0:4.0.6-1.redhat_00001.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8 (eap8-jcip-annotations): ≥ 0:1.0.0-3.redhat_00009.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8 (eap8-slf4j-jboss-logmanager): ≥ 0:2.0.2-1.Final_redhat_00001.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8 (eap8-undertow): ≥ 0:2.3.23-1.SP3_redhat_00001.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9 (eap8-bouncycastle): ≥ 0:1.83.0-1.redhat_00001.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9 (eap8-guava-libraries): ≥ 0:33.0.0-2.jre_redhat_00003.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9 (eap8-jaxb): ≥ 0:4.0.6-1.redhat_00001.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9 (eap8-jcip-annotations): ≥ 0:1.0.0-3.redhat_00009.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9 (eap8-slf4j-jboss-logmanager): ≥ 0:2.0.2-1.Final_redhat_00001.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9 (eap8-undertow): ≥ 0:2.3.23-1.SP3_redhat_00001.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1.3 (io.undertow/undertow-core): ≥ 2.3.20.SP4-redhat-00001; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 (eap8-apache-cxf): ≥ 0:4.0.10-1.redhat_00001.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 (eap8-bouncycastle): ≥ 0:1.82.0-1.redhat_00001.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 (eap8-eap-product-conf-parent): ≥ 0:801.3.0-1.GA_redhat_00001.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 (eap8-eventstream): ≥ 0:1.0.1-3.redhat_00003.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 (eap8-hibernate): ≥ 0:6.6.36-1.Final_redhat_00001.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 (eap8-jboss-el-api_5.0_spec): ≥ 0:4.0.2-1.Final_redhat_00001.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 (eap8-jboss-threads): ≥ 0:2.5.0-1.redhat_00001.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 (eap8-undertow): ≥ 0:2.3.20-2.SP4_redhat_00001.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 (eap8-wildfly): ≥ 0:8.1.3-4.GA_redhat_00006.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 (eap8-wildfly-clustering): ≥ 0:5.0.12-1.Final_redhat_00001.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 (eap8-wildfly-elytron): ≥ 0:2.6.6-1.Final_redhat_00001.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 (eap8-wildfly-javadocs): ≥ 0:8.1.1-4.GA_redhat_00007.1.el8eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 (eap8-apache-cxf): ≥ 0:4.0.10-1.redhat_00001.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 (eap8-bouncycastle): ≥ 0:1.82.0-1.redhat_00001.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 (eap8-eap-product-conf-parent): ≥ 0:801.3.0-1.GA_redhat_00001.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 (eap8-eventstream): ≥ 0:1.0.1-3.redhat_00003.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 (eap8-hibernate): ≥ 0:6.6.36-1.Final_redhat_00001.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 (eap8-jboss-el-api_5.0_spec): ≥ 0:4.0.2-1.Final_redhat_00001.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 (eap8-jboss-threads): ≥ 0:2.5.0-1.redhat_00001.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 (eap8-undertow): ≥ 0:2.3.20-2.SP4_redhat_00001.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 (eap8-wildfly): ≥ 0:8.1.3-4.GA_redhat_00006.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 (eap8-wildfly-clustering): ≥ 0:5.0.12-1.Final_redhat_00001.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 (eap8-wildfly-elytron): ≥ 0:2.6.6-1.Final_redhat_00001.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 (eap8-wildfly-javadocs): ≥ 0:8.1.1-4.GA_redhat_00007.1.el9eap; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Single Sign-On 7.6.13 (undertow-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Single Sign-On 7.6 for RHEL 7 (rh-sso7-keycloak): ≥ 0:18.0.20-1.redhat_00001.1.el7sso; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Single Sign-On 7.6 for RHEL 8 (rh-sso7-keycloak): ≥ 0:18.0.20-1.redhat_00001.1.el8sso; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Single Sign-On 7.6 for RHEL 9 (rh-sso7-keycloak): ≥ 0:18.0.20-1.redhat_00001.1.el9sso; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / RHEL-8 based Middleware Containers (rh-sso-7/sso76-openshift-rhel8): ≥ 7.6-85; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat build of Apache Camel - HawtIO 4 (undertow-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Data Grid 8 (undertow-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 10 (moditect): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (pki-core:10.6/resteasy): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (pki-deps:10.6/resteasy): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (resteasy): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Fuse 7 (undertow-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 7 (undertow-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8 (org.jberet-jberet-parent): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8 (org.jboss.eap-jboss-eap-xp): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform Expansion Pack (org.jboss.eap-jboss-eap-xp): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform Expansion Pack (undertow-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Process Automation 7 (undertow-core): Version range not reported. Source: CNA: redhat

## NVD configuration conditions

Affected CPE matches depend on the following AND/OR and negation conditions:

```json
[
  {
    "negate": false,
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:redhat:build_of_apache_camel_for_spring_boot:-:*:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:redhat:fuse:7.0.0:*:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:redhat:jboss_enterprise_application_platform:7.0.0:*:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:redhat:jboss_enterprise_application_platform:8.0.0:*:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:redhat:jboss_enterprise_application_platform_expansion_pack:-:*:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:redhat:process_automation:7.0:*:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:redhat:single_sign-on:7.0:*:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:redhat:undertow:-:*:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:-:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ],
    "operator": "OR"
  }
]
```

## Severity and prioritization

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: CNA: redhat

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: NVD: secalert@redhat.com

- CISA KEV: No listing in collected sources

- EPSS: 2.33% as of 2026-11-04; percentile 83.54%

- SSVC: exploitation none; automatable yes; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-770, CWE-404

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/errata/RHSA-2025:23143 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:0383 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:0384 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:0386 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:33371 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:33372 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:3889 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:3891 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:3892 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:4915 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:4916 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:4917 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:4924 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:76128 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:76129 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:76130 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:76132 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:76134 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/security/cve/CVE-2025-9784 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2392306 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://github.com/undertow-io/undertow/pull/1778 (CNA: redhat)

- https://github.com/undertow-io/undertow/releases/tag/2.2.38.Final (CNA: redhat)

- https://issues.redhat.com/browse/UNDERTOW-2598 (CNA: redhat)

- https://kb.cert.org/vuls/id/767506 (CNA: redhat)

- https://www.kb.cert.org/vuls/id/767506 (ADP: CVE)

- https://access.redhat.com/errata/RHSA-2025:23143 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:0383 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:0384 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:0386 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:33371 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:33372 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:3889 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:3891 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:3892 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:4915 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:4916 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:4917 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:4924 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:76128 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:76129 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:76130 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:76132 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:76134 (secalert@redhat.com)

- https://access.redhat.com/security/cve/CVE-2025-9784 (secalert@redhat.com; Vendor Advisory)

- https://bugzilla.redhat.com/show_bug.cgi?id=2392306 (secalert@redhat.com; Issue Tracking)

- https://github.com/undertow-io/undertow/pull/1778 (secalert@redhat.com)

- https://github.com/undertow-io/undertow/releases/tag/2.2.38.Final (secalert@redhat.com)

- https://issues.redhat.com/browse/UNDERTOW-2598 (secalert@redhat.com)

- https://kb.cert.org/vuls/id/767506 (secalert@redhat.com)

- https://www.kb.cert.org/vuls/id/767506 (af854a3a-2127-422b-91ae-364da2661108)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2025-9784; retrieved 2026-11-04; source updated 2026-11-04

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-9784; retrieved 2026-11-05; source updated 2026-11-04

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2025-9784; retrieved 2026-11-04; source updated Not reported

Revision: aa865a884f80ea179bfd81ddd41d498dc4cbbbc041d34dce73fa6afebc66c13a

Canonical: https://y2.dev/cve/CVE-2025-9784

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