CVE-2025-53506
Apache Tomcat Coyote vulnerable to Denial of Service via excessive HTTP/2 streams
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. The following versions were EOL at the time the CVE was created but are known to be affected: 8.5.0 through 8.5.100.
Users are recommended to upgrade to version 11.0.9, 10.1.43 or 9.0.107, which fix the issue.
Base CVSS
7.5
EPSS Score
0.19%
Introduced Version
8.5.0
Fix Available
11.0.9,9.0.107,10.1.43
Available Patches
Package
CVEs Fixed
Lines of Code Changed