CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCVE-2025-53506
High (7.5) in apache tomcat. EPSS 2.1% chance of exploitation in the next 30 days. Fixed in org.apache.tomcat:tomcat-coyote 10.1.43, 11.0.9, 9.0.107.
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.
Severity
- EPSS
- 2.1% chance of exploitation in the next 30 days; higher than 81% of CVEs (scores of 2026-10-31)
- CWE
- CWE-400
- Published
- Modified
- Record from
- the NVD, synced
Affected
- apache:tomcat
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-25xr-qj8w-c4vf | Maven | org.apache.tomcat:tomcat-coyote | >=11.0.0-M1 <11.0.9 | 11.0.9 |
| GHSA-25xr-qj8w-c4vf | Maven | org.apache.tomcat:tomcat-coyote | >=10.1.0-M1 <10.1.43 | 10.1.43 |
| GHSA-25xr-qj8w-c4vf | Maven | org.apache.tomcat:tomcat-coyote | >=9.0.0.M1 <9.0.107 | 9.0.107 |
| GHSA-25xr-qj8w-c4vf | Maven | org.apache.tomcat:tomcat-coyote | >=8.5.0 <=8.5.100 | no fix published |
| GHSA-25xr-qj8w-c4vf | Maven | org.apache.tomcat.embed:tomcat-embed-core | >=8.5.0 <=8.5.100 | no fix published |
| GHSA-25xr-qj8w-c4vf | Maven | org.apache.tomcat.embed:tomcat-embed-core | >=9.0.0.M1 <9.0.107 | 9.0.107 |
| GHSA-25xr-qj8w-c4vf | Maven | org.apache.tomcat.embed:tomcat-embed-core | >=10.1.0-M1 <10.1.43 | 10.1.43 |
| GHSA-25xr-qj8w-c4vf | Maven | org.apache.tomcat.embed:tomcat-embed-core | >=11.0.0-M1 <11.0.9 | 11.0.9 |