Microsoft Crypto API 5.131.2600.2180 through 6.0, as used in Outlook, Windows Live Mail, and Office 2007, performs Certificate Revocation List (CRL) checks by using an arbitrary URL from a certificate embedded in a (1) S/MIME e-mail message or (2) signed document, which allows remote attackers to obtain reading times and IP addresses of recipients, and port-scan results, via a crafted certificate with an Authority Information Access (AIA) extension.

Stack-based buffer overflow in Microsoft Excel 2000 SP3, 2002 SP3, 2003 SP2, and 2003 Viewer allows user-assisted remote attackers to execute arbitrary code via a .XLS BIFF file with a malformed Named Graph record, which results in memory corruption.