This indicates an attack attempt to exploit a Command Injection Vulnerability in Vtiger CRM.
The vulnerability is due to an input validation error while parsing a crafted HTTP request. A remote attacker could exploit this to execute arbitrary code within the context of target application, via a crafted HTTP request.
Vtiger CRM 6.0.0 or prior
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.