KB4056890

When calling CoInitializeSecurity, the call will fail if passing RPC_C_IMP_LEVEL_NONE under certain conditions.

When calling CoInitializeSecurity, the call may fail when passing RPC_C_AUTHN_LEVEL_NONE as the authentication level. The error returned on failure is STATUS_BAD_IMPERSONATION_LEVEL.

This issue is resolved in KB4057142.

Because of an issue that affects some versions of antivirus software, this fix applies only to computers on which the antivirus ISV updated the ALLOW REGKEY.

This issue is resolved in KB4088787.

Microsoft has reports of some customers on a small subset of older AMD processors getting into an unbootable state after installing this KB.
 
To prevent this issue, Microsoft will temporarily pause Windows OS updates to devices with impacted AMD processors at this time.

This issue is resolved in KB4057142.

After installing this update, servers where Credential Guard is enabled may experience an unexpected restart with the error, "The system process lsass.exe terminated unexpectedly with status code -1073740791. The system will now shut down and restart."

Event ID 1000 in the application log shows:

"C:\windows\system32\lsass.exe' terminated unexpectedly with status code -1073740791

Faulting application: lsass.exe, Version: 10.0.14393.1770, Time Stamp: 0x59bf2fb2

Faulting module: ntdll.dll, Version: 10.0.14393.1715, Time Stamp: 0x59b0d03e

Exception: 0xc0000409

This issue is resolved in KB4077525.

After installing this update, some users may experience issues logging into some websites when using third-party account credentials in Microsoft Edge.

This issue is resolved in KB4074590.

Editing some group policies using GPMC or AGPM 4.0 may fail with error "The data present in the reparse point buffer is invalid. (Exception from HRESULT: 0x80071128)" after installing this update on a domain controller.

This issue is resolved in KB4074590.