Vulnerability details
CVE-2025-9784
Red Hat Data Grid 8Red Hat Fuse 7Red Hat JBoss Enterprise Application Platform 7Red Hat JBoss Enterprise Application Platform Expansion PackRed Hat Process Automation 7
Undertow: undertow madeyoureset http/2 ddos vulnerability
CVSS 3.1
7.5High
Official 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 scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.5High | 3.1 | CVEProject cvelistV5 (CNA) (redhat) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Red Hat | Red Hat Data Grid 8 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat Fuse 7 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat JBoss Enterprise Application Platform Expansion Pack | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat Process Automation 7 | All | CVEProject cvelistV5 (CNA) |
References and advisories
25- https://access.redhat.com/errata/RHSA-2025:23143 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:0383 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:0384 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:0386 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:33371 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:33372 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:3889 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:3891 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:3892 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:4915 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:4916 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:4917 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:4924 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:76128 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:76129 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:76130 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:76132 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:76134 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2025-9784 vdb-entryx_refsource_REDHAT
- https://bugzilla.redhat.com/show_bug.cgi?id=2392306 issue-trackingx_refsource_REDHAT
- https://github.com/undertow-io/undertow/pull/1778
- https://github.com/undertow-io/undertow/releases/tag/2.2.38.Final
- https://issues.redhat.com/browse/UNDERTOW-2598
- https://kb.cert.org/vuls/id/767506
- https://www.kb.cert.org/vuls/id/767506
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Details
- Published
- 2025-09-02
- Last updated
- 2026-11-05
- State
- Published
- Assigner (CNA)
- redhat
Exploit prediction (EPSS)
2.32%
Probability of exploitation in 30 days
83.5%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-770Allocation of Resources Without Limits or Throttling
- CWE-404Improper Resource Shutdown or Release