CVE-2025-9784
Undertow: undertow madeyoureset http/2 ddos vulnerability
CVSS Score
7.5
EPSS Score
1.6%
EPSS Percentile
81th
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).
| CWE | CWE-770 |
| Published | Sep 2, 2025 |
| Last Updated | Apr 1, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
Red Hat / Red Hat build of Apache Camel 4.14.2 for Spring Boot 3.5.8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.0
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
All versions affected Red Hat / Red Hat build of Apache Camel - HawtIO 4
All versions affected Red Hat / Red Hat Data Grid 8
All versions affected Red Hat / Red Hat Enterprise Linux 10
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Fuse 7
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform 8
All versions affected 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 affected Red Hat / Red Hat Process Automation 7
All versions affected Red Hat / Red Hat Single Sign-On 7
All versions affected References
access.redhat.com: 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: https://access.redhat.com/errata/RHSA-2026:0386 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:3889 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:3891 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:3892 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:4915 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:4916 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:4917 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:4924 access.redhat.com: https://access.redhat.com/security/cve/CVE-2025-9784 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2392306 github.com: https://github.com/undertow-io/undertow/pull/1778 github.com: https://github.com/undertow-io/undertow/releases/tag/2.2.38.Final issues.redhat.com: https://issues.redhat.com/browse/UNDERTOW-2598 kb.cert.org: https://kb.cert.org/vuls/id/767506 kb.cert.org: https://www.kb.cert.org/vuls/id/767506