Answer in brief
CVE-2025-9784 records a High severity (CVSS 7.5) vulnerability in Undertow: undertow madeyoureset http/2 ddos vulnerability. The current sources do not mark it as known exploited. The current feed maps io.undertow:undertow-core (maven), io.undertow:undertow-core (maven), io.undertow:undertow-core (maven), io.undertow:undertow-core (maven). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps io.undertow:undertow-core (maven), io.undertow:undertow-core (maven), io.undertow:undertow-core (maven), io.undertow:undertow-core (maven). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:a:redhat:build_of_apache_camel_for_spring_boot:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:redhat:fuse:7.0.0:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:redhat:jboss_enterprise_application_platform:7.0.0:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:redhat:jboss_enterprise_application_platform:8.0.0:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:redhat:jboss_enterprise_application_platform_expansion_pack:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:redhat:process_automation:7.0:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:redhat:single_sign-on:7.0:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:redhat:undertow:-:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:-:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| io.undertow:undertow-coremaven | <2.2.38.Final | 2.2.38.Final |
| io.undertow:undertow-coremaven | >=2.3.0.Alpha1,<2.3.20.Final | 2.3.20.Final |
| io.undertow:undertow-coremaven | >=0 <2.2.38.Final | 2.2.38.Final |
| io.undertow:undertow-coremaven | >=2.3.0.Alpha1 <2.3.20.Final | 2.3.20.Final |
Published upstream
Sep 2, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 26, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 25, 2026
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).
Quoted source text, attributed separately from HOL analysis.