Adobe Acrobat Reader (acroread) 6, under certain circumstances when running with the "Certified plug-ins only" option disabled, loads plug-…

Adobe Acrobat Reader (acroread) 6, under certain circumstances when running with the "Certified plug-ins only" option disabled, loads plug-ins with signatures used for older versions of Acrobat, which can allow attackers to cause Acrobat to enter Certified mode and run untrusted plugins by modifying the CTIsCertifiedMode function.