CVE-2025-53506
Severity CVSS v4.0:
Pending analysis
Type:
CWE-400
Uncontrolled Resource Consumption ('Resource Exhaustion')
Publication date:
10/07/2025
Last modified:
04/11/2025
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.<br />
<br />
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.<br />
The following versions were EOL at the time the CVE was created but are <br />
known to be affected: 8.5.0 through 8.5.100. Other EOL versions may also be affected.<br />
<br />
<br />
Users are recommended to upgrade to version 11.0.9, 10.1.43 or 9.0.107, which fix the issue.
Impact
Base Score 3.x
7.50
Severity 3.x
HIGH
Vulnerable products and versions
| CPE | From | Up to |
|---|---|---|
| cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:* | 9.0.0 (including) | 9.0.106 (including) |
| cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:* | 10.1.0 (including) | 10.1.42 (including) |
| cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:* | 11.0.0 (including) | 11.0.8 (including) |
To consult the complete list of CPE names with products and versions, see this page