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Message-ID: <74ded356-1a04-4772-a25f-d5370e2e7578@apache.org>
Date: Thu, 10 Jul 2025 20:15:20 +0100
From: Mark Thomas <markt@...che.org>
To: oss-security@...ts.openwall.com
Subject: CVE-2025-53506: Apache Tomcat: DoS via excessive h2 streams at
connection start
Severity: important
Affected versions:
- Apache Tomcat 11.0.0-M1 through 11.0.8
- Apache Tomcat 10.1.0-M1 through 10.1.42
- Apache Tomcat 9.0.0.M1 through 9.0.106
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.
Credit:
Kanatoko (finder)
References:
https://lists.apache.org/thread/p09775q0rd185m6zz98krg0fp45j8kr0
https://tomcat.apache.org/
https://www.cve.org/CVERecord?id=CVE-2025-53506
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