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How the CVE Works
The vulnerability in Apache Commons FileUpload arises due to insufficient limits on multipart header allocations during file uploads. Attackers can craft malicious requests with excessively large or numerous part headers, causing uncontrolled memory consumption. This leads to a Denial-of-Service (DoS) condition by exhausting server resources. The flaw affects versions 1.0 to 1.5 and 2.0.0-M1 to 2.0.0-M3, where the library fails to enforce proper bounds on header parsing.
DailyCVE Form
Platform: Apache Commons
Version: <1.6.0, <2.0.0-M4
Vulnerability: DoS via headers
Severity: High
Date: Jun 16, 2025
Prediction: Patch expected by Jun 30, 2025
What Undercode Say
Analytics:
curl -X POST -H "Content-Type: multipart/form-data" --data-binary @malicious_header.txt http://target/upload
// Vulnerable FileUpload usage ServletFileUpload upload = new ServletFileUpload();
Exploit:
- Craft oversized part headers.
- Send repeated malicious uploads.
- Trigger OOM or CPU exhaustion.
Protection from this CVE:
- Upgrade to v1.6.0/2.0.0-M4.
- Limit header sizes via
setSizeMax(). - Use reverse proxy rate-limiting.
Impact:
- Service disruption.
- Resource starvation.
- No RCE/data compromise.
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
