Buffer overflow in BlackBerry Attachment Service in Research in Motion (RIM) BlackBerry Enterprise Server 2.2 and 4.0 before SP3 Hotfix 4 for IBM Lotus Domino, 3.6 before SP7 and 5.0 before SP3 Hotfix 3 for Microsoft Exchangem, and 4.0 for Novell GroupWise before SP3 Hotfix 1 might allow user-assisted remote attackers to execute arbitrary code on the server via a crafted Microsoft Word document that is opened on a wireless device.