CVE-2025-9784

HighCVSS 7.5/10Last modified Oct 14, 2026

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).

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-770 CWE-404

Affected software

No affected versions have been published.

Timeline

Published: Sep 2, 2025
Last modified: Oct 14, 2026
NVD status: Modified

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