This host is missing an important security update according to Mac OS X 10.6.7 Update/Mac OS X Security Update 2011-002.
Successful exploitation could allow attackers to execute arbitrary code in the context of the browser, inject scripts, bypass certain security restrictions or cause a denial-of-service condition. Impact Level: System/Application
Run Mac Updates and update the Security Update 2011-002 For updates refer to http://support.apple.com/kb/HT1222
For more information on the vulnerabilities refer to the links below.
Certificate Trust Policy.