D-Link DIR-868L B1 router firmware version FW2.05WWB02 contains an unauthenticated OS command injection vulnerability in the fileaccess.cgi component. The endpoint /dws/api/UploadFile accepts a pre_api_arg parameter that is passed directly to system-level shell execution functions without sanitization or authentication. Remote attackers can exploit this to execute arbitrary commands as root via crafted HTTP requests.
Use CWE-78, Dlink vendor hub and Dir-868l Firmware product page to widen CVE-2025-55583 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2019-17621, CVE-2023-39668 and CVE-2023-39667 for nearby disclosures in the same product family.