Multiple heap-based buffer overflows in the AddTab method in the (1) Tab and (2) CTab ActiveX controls in c1sizer.ocx and the (3) TabOne ActiveX control in sizerone.ocx in ComponentOne SizerOne 8.0.20081.140, as used in ComponentOne Studio for ActiveX 2008, TSC2 Help Desk 4.1.8, SAP GUI 6.40 Patch 29 and 7.10, and possibly other products, allow remote attackers to execute arbitrary code by adding many tabs, or adding tabs with long tab captions.