security settingsComputer ConfigurationNot configured

Block Abuse of Exploited Vulnerable Drivers

Prevents execution of vulnerable drivers that can be exploited for privilege escalation. Blocks vulnerable driver abuse attacks.

10 May 20264 min —

Policy path: Computer Configuration > Administrative Templates > Windows Components > Microsoft Defender Antivirus > Microsoft Defender Exploit Guard > Attack Surface Reduction
Supported on: Windows 10, Windows 11, Windows Server 2016 and later

Prevents execution of vulnerable drivers that can be exploited for privilege escalation. Blocks vulnerable driver abuse attacks. Security baselines recommend setting it to 1.

Description

Block Abuse of Exploited Vulnerable Drivers is a Windows Group Policy setting located under Computer Configuration > Administrative Templates > Windows Components > Microsoft Defender Antivirus > Microsoft Defender Exploit Guard > Attack Surface Reduction. It applies to the Computer Configuration branch and is classified as a Warning-level policy in the Attack Surface Reduction (ASR) category.

Prevents execution of vulnerable drivers that can be exploited for privilege escalation. Blocks vulnerable driver abuse attacks.

Microsoft sets the default value to 0 while industry security baselines (CIS, NIST, DISA STIG) recommend 1.

Under the hood, this policy is enforced through the Windows registry at HKLM\Software\Policies\Microsoft\Windows Defender\Windows Defender Exploit Guard\ASR\Rules using the value name 56A863A9-875E-4185-98A7-B882C64B5CE5. Modifying the value directly through regedit.exe or PowerShell produces the same effect as configuring the GPO, but going through Group Policy is preferred so that the setting is centrally managed and survives reboots, image rebuilds, and policy refresh cycles.

In-depth explanation

This setting has a meaningful impact on the security posture or operational stability of the system. Leaving it at the Microsoft default is acceptable for standalone or low-risk environments, but most security baselines (CIS, NIST, DISA STIG) explicitly call for hardening it before the device is exposed to untrusted users or networks.

The policy is grouped under Attack Surface Reduction (ASR), which means it is typically applied through a domain-wide GPO linked at the OU level. In a multi-tenant MSP context, scope it through WMI filters or security group filtering rather than linking at the domain root, so that you can roll out progressively (pilot OU → wider rings → all production).

The setting takes effect after the next Group Policy refresh (gpupdate /force for immediate testing, or by default within ~90 minutes for workstations and ~5 minutes on domain controllers). For computer-side policies a reboot may be required; for user-side policies, a sign-off/sign-on cycle is enough.

Use cases

Apply organization-wide hardening of attack surface reduction (asr) on all domain-joined Windows endpoints.
Roll out a CIS Benchmark-aligned baseline targeting 'Block Abuse of Exploited Vulnerable Drivers' via a dedicated GPO.
Reduce attack surface for accounts that handle privileged credentials or sensitive data.
Standardize the configuration across multiple customer tenants for an MSP-managed fleet.

Security implications

Leaving this policy at default does not directly grant an attacker access, but it widens the blast radius once initial access is obtained – passwords are easier to guess, lockout doesn't fire, audit trails are incomplete, or lateral movement is quieter. Most regulators and cyber-insurance underwriters now expect this control to be in place at least at the recommended level.

How to configure

Open Group Policy Management Console (gpmc.msc) on a domain controller or a workstation with RSAT installed.
Create or edit a GPO linked to the OU containing the target computer configurations. We recommend a dedicated baseline GPO (e.g. SEC – Attack Surface Reduction (ASR)) instead of editing Default Domain Policy.
Navigate to Computer Configuration > Administrative Templates > Windows Components > Microsoft Defender Antivirus > Microsoft Defender Exploit Guard > Attack Surface Reduction.
Open Block Abuse of Exploited Vulnerable Drivers and set it to 1.
Click OK and close the editor.
On the target endpoint, run gpupdate /force (or wait for the next refresh cycle), then verify with rsop.msc or gpresult /h report.html.

Direct registry path: HKLM\Software\Policies\Microsoft\Windows Defender\Windows Defender Exploit Guard\ASR\Rules\56A863A9-875E-4185-98A7-B882C64B5CE5. You can apply the same change with PowerShell:

New-Item -Path 'HKLM\Software\Policies\Microsoft\Windows Defender\Windows Defender Exploit Guard\ASR\Rules' -Force | Out-Null
Set-ItemProperty -Path 'HKLM\Software\Policies\Microsoft\Windows Defender\Windows Defender Exploit Guard\ASR\Rules' -Name '56A863A9-875E-4185-98A7-B882C64B5CE5' -Value <value> -Type DWord

Registry mapping

Registry pathHKLM\Software\Policies\Microsoft\Windows Defender\Windows Defender Exploit Guard\ASR\Rules

Value name56A863A9-875E-4185-98A7-B882C64B5CE5

Value typeREG_DWORD

Enabled value1

Disabled value0

Frequently asked questions

What does the Block Abuse of Exploited Vulnerable Drivers Group Policy do?

Prevents execution of vulnerable drivers that can be exploited for privilege escalation. Blocks vulnerable driver abuse attacks.

Where do I find this setting in the GPO editor?

Open <code>gpmc.msc</code>, then navigate to <code>Computer Configuration > Administrative Templates > Windows Components > Microsoft Defender Antivirus > Microsoft Defender Exploit Guard > Attack Surface Reduction</code> and look for <strong>Block Abuse of Exploited Vulnerable Drivers</strong>.

What is the Microsoft default value?

<code>0</code> on a fresh Windows install. Domain-joined machines may inherit a different value if a baseline GPO is already in place.

What value do security baselines recommend?

<code>1</code> – aligned with CIS, NIST, and DISA STIG guidance for current Windows versions.

Can I configure this without a GPO?

Yes, by writing to <code>HKLM\Software\Policies\Microsoft\Windows Defender\Windows Defender Exploit Guard\ASR\Rules\56A863A9-875E-4185-98A7-B882C64B5CE5</code> directly via <code>regedit</code>, PowerShell, or Intune. A GPO is preferred for centrally managed environments because it survives reimaging and is easier to audit.