The TERASOLUNA Framework Development Team discovered a denial of service vulnerability in Apache Commons FileUpload, a package to make it easy to add robust, high-performance, file upload capability to servlets and web applications. A remote attacker can take advantage of this flaw by sending file upload requests that cause the HTTP server using the Apache Commons Fileupload library to become unresponsive, preventing the server from servicing other requests. Apache Tomcat uses a package renamed copy of Apache Commons FileUpload to implement the file upload requirements of the Servlet specification and is therefore also vulnerable to the denial of service vulnerability.