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Windows NT Server 4.0 | Downloads

Security Update, January 31, 2001

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Read Me First

This update resolves the "Winsock Mutex" security vulnerability in Windows NT® 4.0, and is discussed in Microsoft Security Bulletin MS01-003. Download now to prevent a malicious user from running a special program to disable your network functionality.

This vulnerability exists because the mutex (a tool to prevent more than one process from accessing certain resources at the same time) that is used to control access to networking resources has inappropriately loose permissions. As a result, a malicious user with physical access to a Windows NT 4.0 computer could write a program to gain control of the mutex and deny access to all other users. By denying access to the mutex, the malicious user's program could prevent any other programs from using the networking functions of the affected computer. This update corrects the inappropriate permissions of the affected mutex.

For more information about this vulnerability, please read Microsoft Security Bulletin MS01-003.

System Requirements

This update applies to Windows NT 4.0.

How to download and install

  1. Select your language from the drop-down list above.
  2. Click Next.
  3. On the following page, click Download Now.
  4. Do one of the following:
    • To start the installation immediately, select Run this Program from its Current Location.
    • To copy the download to your computer for installation at a later time, select Save this Program to Disk.
  5. Click OK.

How to use

Restart your computer to complete the installation.

How to uninstall

  1. Click Start, point to Settings and click Control Panel.
  2. Double-click Add/Remove Programs.
  3. Select Windows NT 4.0 Hotfix [See Q279336 for more information] and click Add/Remove to uninstall.


 Last Updated: Friday, April 06, 2001
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