CVE-2025-53506 – Apache Tomcat HTTP/2 Uncontrolled Resource Consumption Denial of Service

The following table lists the changes that have been made to the
CVE-2025-53506 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution
of a vulnerability, and for identifying the most recent changes that may
impact the vulnerability’s severity, exploitability, or other characteristics.

  • New CVE Received
    by [email protected]

    Jul. 10, 2025

    Action Type Old Value New Value
    Added 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.

    Added CWE CWE-400
    Added Reference https://lists.apache.org/thread/p09775q0rd185m6zz98krg0fp45j8kr0
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