Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Apache | Tomcat | >= 9.0.0, <= 9.0.106 |
Related Weaknesses (CWE)
References
- https://lists.apache.org/thread/p09775q0rd185m6zz98krg0fp45j8kr0Issue TrackingMailing ListVendor Advisory
- http://www.openwall.com/lists/oss-security/2025/07/10/13
- https://lists.debian.org/debian-lts-announce/2025/07/msg00009.html
FAQ
What is CVE-2025-53506?
CVE-2025-53506 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 a...
How severe is CVE-2025-53506?
CVE-2025-53506 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-53506?
Check the references section above for vendor advisories and patch information. Affected products include: Apache Tomcat.