Chapter 1 What’s New for FortiOS 5.2.1 : Security Profiles : Vulnerability Scanning Visibility
  
Vulnerability Scanning Visibility
The options to configure vulnerability scanning either in the web-based manager or the CLI are also only available in NAT/Route mode.
Vulnerability scanning options in the web-based manager are now hidden by default. To enable vulnerability scanning, go to System > Config > Features, select Show More, turn on Vulnerability Scan, and select Apply.
 
Vulnerability scanning is also hidden by default for FortiClient profiles until being enabled in the CLI. To enable scanning, enter the following commands:
config endpoint-control profile
edit <profile-name>
config forticlient-winmac-settings
set forticlient-vuln-scan {enable | disable}
set forticlient-vuln-scan-schedule {daily | weekly | monthly}
set forticlient-vuln-scan-on-registration {enable | disable}
set forticlient-ui-options {av | wf | af | vpn | vs}
end
end
end