The SwiftView ActiveX control and plug-in contain a stack buffer overflow, which may allow a remote, unauthorized attacker to execute arbitrary code on a vulnerable system. The risk is MEDIUM. By conviencing a user to view a specially crafted HTML document (e.g., a web page or an HTML email message or attachment), a remote, unauthenticated attacker may be able to execute arbitrary code with the privileges of the user on a vulnerable system.