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Updating Windows to fix the EternalBlue vulnerability and prevent the DoublePulsar attack

EternalBlue is a vulnerability on Windows systems with outdated versions of the Windows File and Printer Sharing service (SMB). We recommend you install the MS17-010 security update from Microsoft to resolve this vulnerability. This protects your PC from the DoublePulsar attack, used by WannaCry ransomware and other threats.

Install the MS17-010 security update

  1. Restart your PC.
  2. Click the Windows Start button, then select Settings (the gear icon).
  3. Go to Update & SecurityWindows Update, and click Check for updates.
  4. Install any available updates.
If you experience issues updating Windows, try the solutions below:

If you are unable to install the update, the only other way to fix this vulnerability is to disable the Windows file sharing service, specifically version 1 of the SMB protocol. Refer to the following Microsoft guide to disable SMBv1:

  1. Click the relevant link below to download the Microsoft security update, then save it to your desktop:
  2. Disconnect your PC from the network by disconnecting the network cable or turning off WiFi, then restart your PC.

    IMPORTANT: If the Double Pulsar exploit is already present, attempting these resolution steps without disconnecting from the network and restarting your PC could prevent your PC from starting.
  3. After your PC restarts, run the installer you saved to your desktop in step 1.
  4. Restart your PC again to complete the installation process.
  5. Reconnect to the network.
If the above troubleshooting steps do not work, try the following alternative solution:
  • Restart your PC and go to Windows Updates (Charms menu ▸ Settings ▸ Change PC settings ▸ Windows Update ▸ Check for updates now). Install any available updates.

If you are unable to install the update, the only other way to fix this vulnerability is to disable the Windows file sharing service, specifically version 1 of the SMB protocol. Refer to the following Microsoft guide to disable SMBv1:

  1. Click the link below to download the Microsoft security update, then save it to your desktop:
  2. Disconnect your PC from the network by disconnecting the network cable or turning off WiFi, then restart your PC.

    IMPORTANT: If the Double Pulsar exploit is already present, attempting these resolution steps without disconnecting from the network and restarting your PC could prevent your PC from starting.
  3. After your PC restarts, run the installer you saved to your desktop in step 1.
  4. Restart your PC again to complete the installation process.
  5. Reconnect to the network.
If the above troubleshooting steps do not work, try the following alternative solution:
  • Restart your PC and go to Windows Updates (Start menu ▸ Control Panel ▸ System & Security ▸ Windows Update ▸ Check for updates). Install any available updates.

If you are unable to install the update, the only other way to fix this vulnerability is to disable the Windows file sharing service, specifically version 1 of the SMB protocol. Refer to the following Microsoft guide to disable SMBv1:

  • AVG Internet Security 20.x
  • AVG AntiVirus FREE 20.x
  • Microsoft Windows 10 Home / Pro / Enterprise / Education - 32 / 64-bit
  • Microsoft Windows 8.1 / Pro / Enterprise - 32 / 64-bit
  • Microsoft Windows 8 / Pro / Enterprise - 32 / 64-bit
  • Microsoft Windows 7 Home Basic / Home Premium / Professional / Enterprise / Ultimate - Service Pack 1, 32 / 64-bit

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