Microsoft KB4512506/KB4512486 is not visible as an available download with currently available versions of Symantec Endpoint Protection 14.x/12.1.x installed.
This issue is specific to Windows 7 SP1 and Windows Server 2008 R2 SP1.
All currently available versions of Symantec Endpoint Protection are affected.
Symantec has identified the potential for a negative interaction between Symantec Endpoint Protection and the contents of future Windows Updates as a result of the changes in this Microsoft KB.
Out of an abundance of caution, Symantec and Microsoft worked together to only allow the update to be visible to versions of Symantec Endpoint Protection that fully support SHA-2 signed Windows executables replaced by this and future updates to Windows 7 SP1 and Windows 2008 R2 SP1.
Symantec is actively working on multiple releases of Symantec Endpoint Protection to address this situation:
14.2 RU1 MP1
This document will be updated as each release becomes available for distribution and include details on how each update can be acquired.
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