Stack-based buffer overflow in the MaskedEdit ActiveX control in Msmask32.ocx 6.0.81.69, and possibly other versions before 6.0.84.18, in Microsoft Visual Studio 6.0 allows remote attackers to execute arbitrary code via a long Mask parameter, as exploited in the wild in August 2008. NOTE: the provenance of this information is unknown; the details are obtained solely from third party information.

More... (http://nvd.nist.gov/nvd.cfm?cvename=CVE-2008-3704)