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Merge pull request #3696 from YongRhee-MSFT/docs-editor/enable-attack-surface-reductio-1746716949
Update enable-attack-surface-reduction.md
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defender-endpoint/enable-attack-surface-reduction.md

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- mde-asr
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ms.custom: admindeeplinkDEFENDER
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search.appverid: met150
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ms.date: 04/30/2025
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ms.date: 05/08/2025
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---
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# Enable attack surface reduction rules
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If a conflicting policy is applied via MDM and GP, the setting applied from Group Policy takes precedence.
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Attack surface reduction rules for managed devices now support behavior for merging settings from different policies to create a policy superset for each device. Only the settings that aren't in conflict are merged, whereas policy conficts aren't added to the superset of rules. Previously, if two policies included conflicts for a single setting, both policies were flagged as being in conflict, and no settings from either profile were deployed.
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Attack surface reduction rules for managed devices now support behavior for merging settings from different policies to create a policy superset for each device. Only the settings that aren't in conflict are merged, whereas policy conflicts aren't added to the superset of rules. Previously, if two policies included conflicts for a single setting, both policies were flagged as being in conflict, and no settings from either profile were deployed.
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Attack surface reduction rule merge behavior works as follows:
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> If you're using Intune on Windows Server 2012 R2 and Windows Server 2016 with the [modern unified solution](onboard-server.md#functionality-in-the-modern-unified-solution-for-windows-server-2016-and-windows-server-2012-r2), you need to set the following attack surface reduction rules to `Not Configured` because they're not supported on these OS versions. Otherwise, these policies fail to apply:
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> - [Block persistence through Windows Management Instrumentation (WMI) event subscription](/defender-endpoint/attack-surface-reduction-rules-reference#block-persistence-through-wmi-event-subscription)
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> - [Block JavaScript or VBScript from launching downloaded executable content](/defender-endpoint/attack-surface-reduction-rules-reference#block-javascript-or-vbscript-from-launching-downloaded-executable-content)
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> - [Block Win32 API calls from Office macro](/defender-endpoint/attack-surface-reduction-rules-reference#block-win32-api-calls-from-office-macros)
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#### Endpoint security policy (Preferred)
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