CVE-2025-53506
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
- Alt Linux, Almalinux, Apache Tomcat, Astra Linux, Bamboo, Bitbucket, Centos, Debian
- Apache Tomcat
- ≤ 9.0.106, 10.1.42, 11.0.8
- Fix
- Available
- CVSS 3.1
- 7.5 HIGH
- EPSS
- 1.9% (78th percentile)
- Weakness
- CWE-400
- NVD status
- Modified
- Published
- 2025-07-10
No indexed exploits for CVE-2025-53506 yet
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No exploit for CVE-2025-53506 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.