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Microsoft Advisory for Active Directory Certificate Services

Updated: 08/04/2021
Detect date

Microsoft is aware of PetitPotam which can potentially be used in an attack on Windows domain controllers or other Windows servers.
To prevent NTLM Relay Attacks on networks with NTLM enabled, domain administrators must ensure that services that permit NTLM authentication make use of protections such as Extended Protection for Authentication (EPA) or signing features such as SMB signing. PetitPotam takes advantage of servers where Active Directory Certificate Services (AD CS) is not configured with protections for NTLM Relay Attacks.

You are potentially vulnerable to this attack if you are using Active Directory Certificate Services (AD CS) with any of the following services:

  • Certificate Authority Web Enrollment
  • Certificate Enrollment Web Service
Affected products

Microsoft Windows Server 2008
Microsoft Windows Server 2012
Microsoft Windows Server 2016
Microsoft Windows Server 2019


Install necessary updates from the KB section, that are listed in your Windows Update (Windows Update usually can be accessed from the Control Panel)

Original advisories


Related products
Microsoft Windows Server
Microsoft Windows Server 2012
Microsoft Windows Server 2008
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