Vulnerability Database
296,137
Total vulnerabilities in the database
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.
Users are recommended to upgrade to version 11.0.9, 10.1.43 or 9.0.107, which fix the issue.
| Software | From | Fixed in |
|---|---|---|
org.apache.tomcat / tomcat-coyote
|
11.0.0-M1 | 11.0.9 |
|
org.apache.tomcat / tomcat-coyote
|
10.1.0-M1 | 10.1.43 |
|
org.apache.tomcat / tomcat-coyote
|
9.0.0.M1 | 9.0.107 |
| apache / tomcat | 10.1.0 | 10.1.42.x |
| apache / tomcat | 11.0.0 | 11.0.8.x |
| apache / tomcat | 9.0.0 | 9.0.106.x |
|
org.apache.tomcat / tomcat-coyote
|
8.5.0 | 8.5.100.x |
- https://github.com/apache/tomcat/commit/2aa6261276ebe50b99276953591e3a2be7898bdb
- https://github.com/apache/tomcat/commit/434772930f362145516dd60681134e7f0cf8115b
- https://github.com/apache/tomcat/commit/be8f330f83ceddaf3baeed57522e571572b6b99b
- https://lists.apache.org/thread/p09775q0rd185m6zz98krg0fp45j8kr0