This indicates an attack attempt to exploit an Remote Code Injection vulnerability in Vtiger CRM.
The vulnerability is due to insufficient sanitizing of user supplied inputs when handling a crafted upload request. An authenticated attacker may be able to exploit this to execute remote code as root.
Vtiger CRM v6.3.0
System Compromise: Remote attackers can gain control of vulnerable systems.
Currently we are unaware of any vendor supplied patch for this issue.