An issue was discovered in Zoho ManageEngine OpManager in builds before 14310. One can bypass the user password requirement and execute commands on the server. The "username+‘@opm’ string is used for the password. For example, if the username is admin, the password is admin@opm.
pentest.com.tr/exploits/DEFCON-ManageEngine-OpManager-v12-4-Unauthenticated-Remote-Command-Execution.html
www.exploit-db.com/exploits/47229
www.manageengine.com/network-monitoring/security-updates/cve-2019-15106.html
www.manageengine.com/products/applications_manager/security-updates/security-updates-cve-2019-15106.html