This host is missing an important security update according to Microsoft Bulletin MS13-087.
Successful exploitation will allow remote attackers to obtain potentially sensitive information. Impact Level: Application
Download and update mentioned hotfixes in the advisory from the below link, https://technet.microsoft.com/en-us/security/bulletin/ms13-087
Flaw is caused when Silverlight improperly handles certain objects in memory.
Microsoft Silverlight version 5 on Mac OS X
Get the installed version with the help of detect NVT and check the version is vulnerable or not.
- Mac OS X 'Internet plug-ins' Unspecified Vulnerability (2012-003)
- Microsoft Silverlight Information Disclosure Vulnerability-2890788 (Mac OS X)
- Mac OS X Security Update 2009-004
- MS Office Outlook Information Disclosure Vulnerability - 2813682 (Mac OS X)
- Microsoft Office Privilege Elevation Vulnerability - 2721015 (Mac OS X)