Microsoft KB Update (October 14, 2025) – Medium Severity

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On October 14, 2025, Microsoft released KB updates that conflict with Netwrix Threat Prevention (formerly StealthINTERCEPT) agents.
If these KBs are applied before updating the agents, certain Kerberos authentication activity events will no longer be captured or blocked.

Netwrix recommends delaying the deployment of these KBs if your organization relies on these event types. The Netwrix development and QA teams are working on updated agents compatible with these KBs and will send another notice when they are available.

:double_exclamation_mark: Important Details
If your organization does not use Netwrix Threat Prevention (formerly StealthINTERCEPT) for the following activity event collection, or such events are not deemed important, you may elect to deploy the following Microsoft KBs in advance of updated Netwrix Threat Prevention (formerly StealthINTERCEPT) agents.

No other aspect of Netwrix Threat Prevention (formerly StealthINTERCEPT) operation is impacted by the October 14, 2025 KBs beyond what is described below. There is no adverse impact to domain controllers if the KBs are deployed without updating the agents.

Event Types Affected:
Capture or block Kerberos authentication activity

Severity:
Medium

Affected Products:

  • Netwrix Threat Prevention (formerly StealthINTERCEPT) for Active Directory
  • Netwrix Threat Manager (formerly StealthDEFEND) for Active Directory

Affected Systems:

  • Windows Server 2022 (for Active Directory)
  • Windows Server 2019 (for Active Directory)

Affected Microsoft KBs:

  • Windows Server 2022 KB5066782
  • Windows Server 2019 KB5066586

Impact:

Functional:

  • 2022 Server – KB5066782
    • Netwrix Threat Prevention (formerly StealthINTERCEPT) agents will lose the ability to capture or block Kerberos authentication activity
    • Log:
      • Couldn’t resolve KdcGetTicket
      • Couldn’t resolve KdcVerifyKdcRequest
      • Couldn’t resolve HandleTGSRequest
      • Couldn’t resolve I_GetASTicket
  • 2019 Server – KB5066586
    • Netwrix Threat Prevention (formerly StealthINTERCEPT) agents will lose the ability to capture or block Kerberos authentication activity
    • Log:
      • Couldn’t resolve KdcGetTicket
      • Couldn’t resolve KdcVerifyKdcRequest
      • Couldn’t resolve HandleTGSRequest
      • Couldn’t resolve I_GetASTicket

Stability:
No stability impact on any server platforms or domain controllers.

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