CVE-2025-53506

Published Jul 10, 2025

Last updated 3 days ago

Overview

AI description

Automated description summarized from trusted sources.

CVE-2025-53506 is an uncontrolled resource consumption vulnerability affecting Apache Tomcat. The vulnerability occurs when an HTTP/2 client does not acknowledge the initial settings frame, which reduces the maximum permitted concurrent streams. This issue affects Apache Tomcat versions 11.0.0-M1 through 11.0.8, 10.1.0-M1 through 10.1.42, and 9.0.0.M1 through 9.0.106. To resolve this vulnerability, users are advised to upgrade to versions 11.0.9, 10.1.43, or 9.0.107.

Description: Uncontrolled Resource Consumption vulnerability in Apache Tomcat if an HTTP/2 client did not acknowledge the initial settings frame that reduces the maximum permitted concurrent streams. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.8, from 10.1.0-M1 through 10.1.42, from 9.0.0.M1 through 9.0.106. Users are recommended to upgrade to version 11.0.9, 10.1.43 or 9.0.107, which fix the issue.
Source: security@apache.org
NVD status: Awaiting Analysis

Risk scores

CVSS 3.1

Type: Secondary
Base score: 7.5
Impact score: 3.6
Exploitability score: 3.9
Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Severity: HIGH

Weaknesses

security@apache.org: CWE-400

Hype score: Not currently trending

References