{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/commons-fileupload/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[],"_cs_exploited":false,"_cs_products":[],"_cs_severities":["medium"],"_cs_tags":["apache","commons-fileupload","denial-of-service","vulnerability"],"_cs_type":"advisory","_cs_vendors":[],"content_html":"\u003cp\u003eA vulnerability exists in Apache Commons FileUpload, a library used for handling file uploads in web applications. An unauthenticated, remote attacker can exploit this flaw to trigger a denial-of-service (DoS) condition. The specific nature of the vulnerability is not detailed in the provided source, but it generally involves sending malicious requests that consume excessive server resources, leading to service disruption. This vulnerability can affect any web application that relies on a vulnerable version of the Apache Commons FileUpload library. While the exact version range isn\u0026rsquo;t specified, defenders should investigate and patch any instance of this library in their environment.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe attacker identifies a web application using a vulnerable version of Apache Commons FileUpload.\u003c/li\u003e\n\u003cli\u003eThe attacker crafts a malicious HTTP request containing a specially designed file upload.\u003c/li\u003e\n\u003cli\u003eThe malicious request is sent to the web application\u0026rsquo;s file upload endpoint.\u003c/li\u003e\n\u003cli\u003eThe Apache Commons FileUpload library processes the malicious file upload request.\u003c/li\u003e\n\u003cli\u003eThe vulnerability is triggered, causing excessive resource consumption (CPU, memory, disk I/O).\u003c/li\u003e\n\u003cli\u003eThe server becomes overloaded, leading to slow response times or complete unresponsiveness.\u003c/li\u003e\n\u003cli\u003eLegitimate users are unable to access the web application.\u003c/li\u003e\n\u003cli\u003eThe denial-of-service condition persists until the server is restarted or the malicious requests are blocked.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of this vulnerability results in a denial-of-service condition, rendering the affected web application unavailable to legitimate users. The impact ranges from temporary service disruptions to complete outages, potentially affecting business operations and user experience. The number of affected applications depends on the prevalence of the vulnerable Apache Commons FileUpload library. Organizations in all sectors that use this library for handling file uploads are potentially at risk.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eIdentify all instances of Apache Commons FileUpload library in your web applications and infrastructure.\u003c/li\u003e\n\u003cli\u003eUpgrade to the latest version of Apache Commons FileUpload that addresses the denial-of-service vulnerability (check the Apache Commons FileUpload project page for details).\u003c/li\u003e\n\u003cli\u003eImplement rate limiting on file upload endpoints to mitigate the impact of malicious requests.\u003c/li\u003e\n\u003cli\u003eMonitor web server logs for suspicious activity related to file uploads (see example Sigma rule below).\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-03-24T10:17:00Z","date_published":"2026-03-24T10:17:00Z","id":"/briefs/2024-05-apache-commons-fileupload-dos/","summary":"A remote, anonymous attacker can exploit a vulnerability in Apache Commons FileUpload to perform a denial of service attack.","title":"Apache Commons FileUpload Denial of Service Vulnerability","url":"https://feed.craftedsignal.io/briefs/2024-05-apache-commons-fileupload-dos/"}],"language":"en","title":"CraftedSignal Threat Feed — Commons-Fileupload","version":"https://jsonfeed.org/version/1.1"}