How to Find Windows Defender Antivirus Signature Version in Windows 11

Windows Security (formerly Windows Defender) relies on regularly updated security intelligence (also called antivirus signatures) to detect the latest threats. These updates ensure your system can identify new malware, viruses, and other security risks effectively.

Sometimes, you may need to check the current signature version—especially when troubleshooting detection issues, verifying updates, or confirming your system is protected with the latest definitions. Fortunately, Windows 11 provides multiple ways to view this information.

In this guide, we’ll walk you through how to find the Windows Defender Antivirus signature version in Windows 11.

How to Find Windows Defender Antivirus Signature Version in Windows 11

Before you begin, note that the signature version is listed under “Security intelligence version” in Windows Security. The methods below will help you locate it quickly using different approaches.

1. Check via Windows Security App

This is the easiest and most common method.

1. Press Windows + I to open Settings.
2. Go to Privacy & Security > Windows Security.
3. Click Open Windows Security.
4. Select Virus & threat protection.
5. Scroll down and click Protection updates.
6. Look for Security intelligence version.

This shows the currently installed antivirus signature version.

2. Check Using PowerShell

You can also retrieve the version using a command.

1. Press Windows + X and select Windows Terminal (Admin).
2. Run the following command: Get-MpComputerStatus | Select-Object AntivirusSignatureVersion
3. Press Enter.

The output will display the current signature version.

3. Check via Command Prompt

Command Prompt provides another quick method.

1. Open Command Prompt as administrator.
2. Run: "%ProgramFiles%\Windows Defender\MpCmdRun.exe" -SignatureUpdate -MMPC
3. Review the output for signature details.

This command can also trigger updates if needed.

4. Verify Last Update Time

Along with the version, you can check when it was last updated.

1. Open Windows Security > Virus & threat protection.
2. Click Protection updates.
3. Check Last updated time.

This helps confirm whether your definitions are up to date.

5. Update Signature Version (If Needed)

If your signature version is outdated, update it manually.

1. Open Windows Security.
2. Go to Virus & threat protection.
3. Click Protection updates.
4. Select Check for updates.

Keeping signatures updated ensures maximum protection.

Conclusion

Checking the Windows Defender Antivirus signature version in Windows 11 is simple and can be done through the Windows Security app, PowerShell, or Command Prompt. This information helps you verify that your system is protected with the latest threat definitions.

By following the steps in this guide, you can easily monitor and update your antivirus signatures, ensuring your system remains secure against evolving threats.