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CVE-2025-52520

HIGH

Apache Tomcat Catalina is vulnerable to DoS attack through bypassing of size limits

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

Summary

For some unlikely configurations of multipart upload, an Integer Overflow vulnerability in Apache Tomcat could lead to a DoS via bypassing of size limits. 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, older, 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.

Remediation

Upgrade to the fixed version using your package manager.

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

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

Affected Packages (8)

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

Vulnerability Classification

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

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-2025-52520?
Apache Tomcat Catalina is vulnerable to DoS attack through bypassing of size limits 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-2025-52520?
CVE-2025-52520 affects org.apache.tomcat:tomcat-catalina and org.apache.tomcat.embed:tomcat-embed-core. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2025-52520 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-wr62-c79q-cv37
BIT-tomcat-2025-52520

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