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).
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Redhat | Build Of Apache Camel For Spring Boot | - |
| Redhat | Fuse | 7.0.0 |
| Redhat | Jboss Enterprise Application Platform | 7.0.0 |
| Redhat | Jboss Enterprise Application Platform Expansion Pack | - |
| Redhat | Process Automation | 7.0 |
| Redhat | Single Sign-On | 7.0 |
| Redhat | Undertow | - |
| Redhat | Enterprise Linux | 8.0 |
Related Weaknesses (CWE)
References
- https://access.redhat.com/errata/RHSA-2025:23143
- https://access.redhat.com/errata/RHSA-2026:0383
- https://access.redhat.com/errata/RHSA-2026:0384
- https://access.redhat.com/errata/RHSA-2026:0386
- https://access.redhat.com/errata/RHSA-2026:3889
- https://access.redhat.com/errata/RHSA-2026:3891
- https://access.redhat.com/errata/RHSA-2026:3892
- https://access.redhat.com/errata/RHSA-2026:4915
- https://access.redhat.com/errata/RHSA-2026:4916
- https://access.redhat.com/errata/RHSA-2026:4917
- https://access.redhat.com/errata/RHSA-2026:4924
- https://access.redhat.com/security/cve/CVE-2025-9784Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2392306Issue Tracking
- https://github.com/undertow-io/undertow/pull/1778
- https://github.com/undertow-io/undertow/releases/tag/2.2.38.Final
FAQ
What is CVE-2025-9784?
CVE-2025-9784 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 malic...
How severe is CVE-2025-9784?
CVE-2025-9784 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-9784?
Check the references section above for vendor advisories and patch information. Affected products include: Redhat Build Of Apache Camel For Spring Boot, Redhat Fuse, Redhat Jboss Enterprise Application Platform, Redhat Jboss Enterprise Application Platform Expansion Pack, Redhat Process Automation.