Skip to content
CVE PROGRAM SOURCE RECORD7.5 High

CVE-2025-53506

Apache Tomcat: DoS via excessive h2 streams at connection start

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. Other EOL versions may also be affected. Users are recommended to upgrade to version 11.0.9, 10.1.43 or 9.0.107, which fix the issue.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Apache Software Foundation Apache Tomcat

Default version status: unaffected

  • 11.0.0-M1 to ≤ 11.0.8affected
  • 10.1.0-M1 to ≤ 10.1.42affected
  • 9.0.0.M1 to ≤ 9.0.106affected
  • 8.5.0 to ≤ 8.5.100affected
  • 10.0.0-M1 to ≤ 10.0.27unknown

References