Apache Tomcat up to 9.0.106/10.1.42/11.0.8 Multipart Upload integer overflow

Summaryinfo

A vulnerability classified as critical was found in Apache Tomcat up to 9.0.106/10.1.42/11.0.8. The affected element is an unknown function of the component Multipart Upload Handler. Executing a manipulation can lead to integer overflow. This vulnerability is handled as CVE-2025-52520. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical was found in Apache Tomcat up to 9.0.106/10.1.42/11.0.8. This vulnerability affects an unknown function of the component Multipart Upload Handler. The manipulation with an unknown input leads to a integer overflow vulnerability. The CWE definition for the vulnerability is CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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. Users are recommended to upgrade to version 11.0.9, 10.1.43 or 9.0.107, which fix the issue.

The weakness was released by Saravana Kumar. The advisory is shared for download at lists.apache.org. This vulnerability was named CVE-2025-52520 since 06/17/2025. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 12/13/2025).

The vulnerability scanner Nessus provides a plugin with the ID 241706 (Apache Tomcat 11.0.0.M1 < 11.0.9 multiple vulnerabilities), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 9.0.107, 10.1.43 or 11.0.9 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (241706), EUVD (EUVD-2025-21044) and CERT Bund (WID-SEC-2025-1468). Once again VulDB remains the best source for vulnerability data.

Affected

• Debian Linux
• Amazon Linux 2
• IBM Power Hardware Management Console
• Red Hat Enterprise Linux
• SUSE Linux
• Oracle Linux
• SUSE openSUSE
• RESF Rocky Linux
• Apache Tomcat
• Red Hat JBoss Web Server
• Open Source Camunda
• IBM Integration Bus
• Atlassian Bamboo
• Atlassian Bitbucket
• Atlassian Jira
• Absolute Secure Access
• SAS Institute Base SAS
• Dell Secure Connect Gateway
• Dell NetWorker

Productinfo

Type

• Application Server Software

Vendor

• Apache

Name

• Tomcat

Version

• 9.0.106
• 10.1.0
• 10.1.1
• 10.1.2
• 10.1.3
• 10.1.4
• 10.1.5
• 10.1.6
• 10.1.7
• 10.1.8
• 10.1.9
• 10.1.10
• 10.1.11
• 10.1.12
• 10.1.13
• 10.1.14
• 10.1.15
• 10.1.16
• 10.1.17
• 10.1.18
• 10.1.19
• 10.1.20
• 10.1.21
• 10.1.22
• 10.1.23
• 10.1.24
• 10.1.25
• 10.1.26
• 10.1.27
• 10.1.28
• 10.1.29
• 10.1.30
• 10.1.31
• 10.1.32
• 10.1.33
• 10.1.34
• 10.1.35
• 10.1.36
• 10.1.37
• 10.1.38
• 10.1.39
• 10.1.40
• 10.1.41
• 10.1.42
• 11.0.0
• 11.0.1
• 11.0.2
• 11.0.3
• 11.0.4
• 11.0.5
• 11.0.6
• 11.0.7
• 11.0.8

License

• open-source

Website

• Vendor: https://www.apache.org/

CPE 2.3info

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Entryinfo

Once again VulDB remains the best source for vulnerability data.

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