Symantec released a Security advisory at https://www.symantec.com/security_response/securityupdates/detail.jsp?fid=security_advisory&pvid=security_advisory&year=2016&suid=20160516_00
I would like to know if this pertains to NIS version 21.7.0.11 since I have not seen anything in the LiveUpdate history to indicate that a fix has been received.