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OCX controls are containers that can hold multiple ActiveX controls. A particular OCX control, associated with Windows Media Player, could be used in a denial of service attack against RTF-enabled e-mail clients such as Microsoft Outlook and Outlook Express. If the affected control were programmatically embedded into an RTF mail and then sent to another user, the user’s mail client would fail when he closed the mail. The vulnerability would not cause any lasting effects. The user could resume normal operation by restarting the mail client and deleting the affected mail. Although the affected OCX control is associated with Windows Media Player, it poses no threat to it – the vulnerability could only be used to attack e-mail clients.“OCX Attachment” Vulnerability Patch FAQ The vulnerability only occurs if both Windows Media Player 7 and an affected e-mail client (Outlook or Outlook Express) are installed on the same machine. Machines that only fulfill one of these conditions are not affected...