how to fix 8dot3 name vulnerability on App service?

Question

how to fix 8dot3 name vulnerability on App service?

Gallatin 21V 206

When we conducted the security assessment, we found that our web app had an ISS short file name (8dot3 name) vulnerability, later we learned it's due to App services are running on Windows 2016 server, it's a vulnerability of Windows 2016 server, https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/fsutil-8dot3name , now we need to fix this vulnerability for our web app, pls give us some guidelines to fix it, thank you very much.

Deepanshu katara 16,790 Reputation points MVP Moderator

2025-07-04T06:47:52.71+00:00

Hello , Welcome to MS Q&A

To address the ISS short file name (8dot3 name) vulnerability in your Azure App Services running on Windows 2016 server, you can follow these guidelines:

Understand the Vulnerability: The 8dot3 name vulnerability is related to the way Windows handles short file names. It's important to understand how this affects your application and the potential security risks involved.

Disable 8dot3 Name Creation: You can disable the creation of 8dot3 names on the volume where your application is hosted. This can be done using the fsutil command. For detailed instructions, refer to the Microsoft documentation on fsutil 8dot3name.

Update Your Application: Ensure that your application and any dependencies are updated to the latest versions. This can help mitigate vulnerabilities that may be exploited through the 8dot3 name issue.

Monitor Security Updates: Keep an eye on security updates and patches provided by Microsoft for Windows Server 2016. Regularly applying these updates can help protect your application from known vulnerabilities.

Consult Azure Security Resources: Utilize Azure's security resources and tools to assess and improve the security posture of your application. You can find more information in the Azure App Service security FAQ.

By following these steps, you can help mitigate the 8dot3 name vulnerability in your Azure App Services.

Pls check and let us know if any ques

Kindly accept answer if it helps

Thanks

Deepanshu

Your answer

Deepanshu katara 16,790 Reputation points MVP Moderator

2025-07-04T06:47:52.71+00:00

Hello , Welcome to MS Q&A

To address the ISS short file name (8dot3 name) vulnerability in your Azure App Services running on Windows 2016 server, you can follow these guidelines:

Understand the Vulnerability: The 8dot3 name vulnerability is related to the way Windows handles short file names. It's important to understand how this affects your application and the potential security risks involved.

Disable 8dot3 Name Creation: You can disable the creation of 8dot3 names on the volume where your application is hosted. This can be done using the fsutil command. For detailed instructions, refer to the Microsoft documentation on fsutil 8dot3name.

Update Your Application: Ensure that your application and any dependencies are updated to the latest versions. This can help mitigate vulnerabilities that may be exploited through the 8dot3 name issue.

Monitor Security Updates: Keep an eye on security updates and patches provided by Microsoft for Windows Server 2016. Regularly applying these updates can help protect your application from known vulnerabilities.

Consult Azure Security Resources: Utilize Azure's security resources and tools to assess and improve the security posture of your application. You can find more information in the Azure App Service security FAQ.

By following these steps, you can help mitigate the 8dot3 name vulnerability in your Azure App Services.

Pls check and let us know if any ques

Kindly accept answer if it helps

Thanks

Deepanshu

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how to fix 8dot3 name vulnerability on App service?

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