#VU118734 Resource exhaustion in Undertow - CVE-2025-9784

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Main Vulnerability Database Vulnerabilities #VU118734

#VU118734 Resource exhaustion in Undertow - CVE-2025-9784

Published: November 24, 2025


Vulnerability identifier: #VU118734
Vulnerability risk: Medium
CVSSv4.0: 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/E:U/U:Green
CVE-ID: CVE-2025-9784
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vulnerable software:
Undertow
Software vendor:
Red Hat Inc.

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources when handling HTTP/2 requests. A remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.

The vulnerability was dubbed HTTP/2 Made You Reset Attack.


Remediation

Install updates from vendor's website.

External links