Apache Tomcat: DoS via excessive h2 streams at connection start
Summary
Apache Tomcat: DoS via excessive h2 streams at connection start
Original description
The description as published by the source.
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 through 11.0.8, from 10.1.0 through 10.1.42, from 9.0.0 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.
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
Affected packages
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2025-53506 tomcat10 Fixed in: 10.1.52-1~deb12u1
- Ubuntu UBUNTU-CVE-2025-53506 tomcat6
References
- advisory lists.apache.org
- web nvd.nist.gov
- web openwall.com
- web lists.debian.org