Incorrect Access Control in FailOverHelperServlet in Zoho ManageEngine Netflow Analyzer before build 123137, Network Configuration Manager before build 123128, OpManager before build 123148, OpUtils before build 123161, and Firewall Analyzer before build 123147 allows attackers to read certain files on the web server without login by sending a specially crafted request to the server with the operation=copyfile&fileName= substring.