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CVE-2025-53506

HIGH

Apache Tomcat Coyote vulnerable to Denial of Service via excessive HTTP/2 streams

Published July 10, 2025Updated March 6, 2026Source: osv

Summary

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.

Remediation

Upgrade to the fixed version using your package manager.

Maven
Update org.apache.tomcat.embed:tomcat-embed-core to 9.0.107 or later
<!-- Update pom.xml dependency version to 9.0.107 for org.apache.tomcat.embed:tomcat-embed-core -->
Maven
Update org.apache.tomcat.embed:tomcat-embed-core to 10.1.43 or later
<!-- Update pom.xml dependency version to 10.1.43 for org.apache.tomcat.embed:tomcat-embed-core -->
Maven
Update org.apache.tomcat.embed:tomcat-embed-core to 11.0.9 or later
<!-- Update pom.xml dependency version to 11.0.9 for org.apache.tomcat.embed:tomcat-embed-core -->
Maven
Update org.apache.tomcat:tomcat-coyote to 11.0.9 or later
<!-- Update pom.xml dependency version to 11.0.9 for org.apache.tomcat:tomcat-coyote -->
Maven
Update org.apache.tomcat:tomcat-coyote to 9.0.107 or later
<!-- Update pom.xml dependency version to 9.0.107 for org.apache.tomcat:tomcat-coyote -->
Maven
Update org.apache.tomcat:tomcat-coyote to 10.1.43 or later
<!-- Update pom.xml dependency version to 10.1.43 for org.apache.tomcat:tomcat-coyote -->

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (8)

PackageEcosystemAffectedFixed In
org.apache.tomcat.embed:tomcat-embed-core
maven
8.5.0, 8.5.100, 8.5.11, 8.5.12 (+81 more)Range-based data available
org.apache.tomcat.embed:tomcat-embed-core
maven
9.0.0.M1, 9.0.0.M10, 9.0.0.M11, 9.0.0.M13 (+102 more)9.0.107
org.apache.tomcat.embed:tomcat-embed-core
maven
10.1.0, 10.1.0-M1, 10.1.0-M10, 10.1.0-M11 (+46 more)10.1.43
org.apache.tomcat.embed:tomcat-embed-core
maven
11.0.0, 11.0.0-M1, 11.0.0-M10, 11.0.0-M11 (+28 more)11.0.9
org.apache.tomcat:tomcat-coyote
maven
11.0.0, 11.0.0-M1, 11.0.0-M10, 11.0.0-M11 (+28 more)11.0.9
org.apache.tomcat:tomcat-coyote
maven
8.5.0, 8.5.100, 8.5.11, 8.5.12 (+81 more)Range-based data available
org.apache.tomcat:tomcat-coyote
maven
9.0.0.M1, 9.0.0.M10, 9.0.0.M11, 9.0.0.M13 (+102 more)9.0.107
org.apache.tomcat:tomcat-coyote
maven
10.1.0, 10.1.0-M1, 10.1.0-M10, 10.1.0-M11 (+46 more)10.1.43

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-400
    Uncontrolled Resource ConsumptionMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 7.5 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Frequently Asked Questions

What is CVE-2025-53506?
Apache Tomcat Coyote vulnerable to Denial of Service via excessive HTTP/2 streams This vulnerability has been assigned a severity rating of HIGH (CVSS score: 7.5/10).
How do I check if my project is affected by CVE-2025-53506?
CVE-2025-53506 affects org.apache.tomcat.embed:tomcat-embed-core and org.apache.tomcat:tomcat-coyote. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2025-53506 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
7.5

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-25xr-qj8w-c4vf
BIT-tomcat-2025-53506

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