This update resolves the 'Unchecked buffer in the Multiple UNC Provider' security vulnerability in Windows NT 4.0 and is discussed in Microsoft Security Bulletin MS02-017. Download it now to prevent a malicious user from exploiting a buffer overflow vulnerability to either cause your computer to restart or to run unauthorized programs on your computer.

The vulnerability results because of a flaw in the Multiple UNC (uniform naming convention) Provider (MUP), which is a network file system resource locator that runs in kernel-mode memory in Windows. Due to an unchecked buffer (a temporary storage area of limited capacity), a malicious user can send a specially malformed request and either cause the computer to restart or run programs as if he or she were the user.