CVE-2025-9784 – io.undertow:undertow-core

Package

Manager: maven
Name: io.undertow:undertow-core
Vulnerable Version: >=0 <=2.3.18.final

Severity

Level: High

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

EPSS: 0.00179 pctl0.39793

Details

Undertow MadeYouReset HTTP/2 DDoS Vulnerability 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).

Metadata

Created: 2025-09-02T15:31:08Z
Modified: 2025-09-02T20:54:27Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/09/GHSA-95h4-w6j8-2rp8/GHSA-95h4-w6j8-2rp8.json
CWE IDs: ["CWE-404"]
Alternative ID: GHSA-95h4-w6j8-2rp8
Finding: F108
Auto approve: 1