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How the CVE Works
CVE-2025-52520 exploits an integer overflow vulnerability in Apache Tomcat’s multipart upload handling. When processing large file uploads, improper size limit checks allow attackers to bypass restrictions by triggering an integer overflow. This leads to resource exhaustion, crashing the server (DoS). The flaw affects Tomcat versions 11.0.0-M1 to 11.0.8, 10.1.0-M1 to 10.1.42, and 9.0.0.M1 to 9.0.106.
DailyCVE Form
Platform: Apache Tomcat
Version: 9.0.0.M1-9.0.106
Vulnerability: Integer Overflow
Severity: Critical
Date: 07/29/2025
Prediction: Patch by 08/15/2025
What Undercode Say
Analytics:
curl -I http://vulnerable-tomcat/server-status grep "max-http-header-size" conf/server.xml
Exploit:
import requests
requests.post(target, files={"file": ("overflow", "A" 230)})
Protection from this CVE:
- Upgrade to Tomcat 11.0.9
- Disable multipart uploads
- Apply input validation
Impact:
- Remote DoS
- Service disruption
- Memory exhaustion
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
