For all those MR folks who use MS, they call it "critical". http://money.cnn.com/2004/02/10/technology/windows_flaw.reut/index.htm?cnn=yes Here's the MS page with the description: http://www.microsoft.com/security/security_bulletins/20040210_windows.asp "A security vulnerability exists in the Microsoft ASN.1 Library that could allow code execution on an affected system. The vulnerability is caused by an unchecked buffer in the Microsoft ASN.1 Library, which could result in a buffer overflow. An attacker who successfully exploited this buffer overflow vulnerability could execute code with system privileges on an affected system. The attacker could then take any action on the system, including installing programs, viewing data, changing data, deleting data, or creating new accounts with full privileges."