This indicates the detection of a Zero-Day vulnerability discovered by Fortinet's FortiGuard Labs.
This signature should help mitigate the threat proactively - both prior to, and after an official fix is available from the vendor.
Once this official fix is available, further details about our discovery will be made available in an advisory on our FortiGuard Center (http://www.fortiguard.com). The signature name and description will also be updated then
This is a Zero-Day (unpatched) vulnerability that has been discovered by Fortinet's FortiGuard Labs
Any Zero-Day vulnerabilities can have a large impact due to the fact that they remain unpatched, making exploit attempts more effective since the given attack vector remains open