The issue is related to multiple stack-based buffer overflows in the PVATLCalendar.PVCalendar.1 ActiveX control. This can be exploited by remote attackers to execute arbitrary code via long property values, such as ` DOWText0`, ` DOWText1`, ` DOWText2`, ` DOWText3`, ` DOWText4`, ` DOWText5`, ` DOWText6`, ` MonthText0`, ` MonthText1`, ` MonthText2`, ` MonthText3`, ` MonthText4`, ` MonthText5`, ` MonthText6`, ` MonthText7`, ` MonthText8`, ` MonthText9`, ` MonthText10`, or ` MonthText11`, when executing the Save method. It is noted that while the vendor states authenticated user involvement is required, authentication is not needed to attack a client machine that loads this control.