Microsoft Windows Vista SP2 up to Server 2012 R2 Kernel Mode Driver win32k.sys access control

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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A vulnerability classified as critical was found in Microsoft Windows Vista SP2 up to Server 2012 R2 (Operating System). This vulnerability affects an unknown part in the library win32k.sys of the component Kernel Mode Driver. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-264. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was published 03/08/2016 by Nils with Google Project Zero as MS16-034 as confirmed bulletin (Technet). The advisory is shared for download at This vulnerability was named CVE-2016-0093 since 12/04/2015. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details and also a public exploit are known. The MITRE ATT&CK project declares the attack technique as T1068.

It is possible to download the exploit at It is declared as proof-of-concept. As 0-day the estimated underground price was around $25k-$100k. The vulnerability scanner Nessus provides a plugin with the ID 89756 (MS16-034: Security Update for Windows Kernel-Mode Drivers to Address Elevation of Privilege (3143145)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows : Microsoft Bulletins. The commercial vulnerability scanner Qualys is able to test this issue with plugin 91185 (Microsoft Windows Kernel-Mode Drivers Elevation of Privilege Vulnerability (MS16-034)).

Applying the patch MS16-034 is able to eliminate this problem. The bugfix is ready for download at A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Exploit-DB (39648), Tenable (89756), SecurityFocus (BID 84054†) and Vulnerability Center (SBV-57106†). Additional details are provided at







CPE 2.3info

CPE 2.2info


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VulDB Meta Base Score: 8.4
VulDB Meta Temp Score: 8.0

VulDB Base Score: 9.0
VulDB Temp Score: 8.1
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Class: Access control
CWE: CWE-264

Local: No
Remote: Yes

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Access: Public
Status: Proof-of-Concept
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Nessus ID: 89756
Nessus Name: MS16-034: Security Update for Windows Kernel-Mode Drivers to Address Elevation of Privilege (3143145)
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OpenVAS ID: 802074
OpenVAS Name: Microsoft Kernel-Mode Drivers Privilege Elevation Vulnerabilities (3143145)
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Recommended: Patch
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Patch: MS16-034


12/04/2015 🔍
03/08/2016 +95 days 🔍
03/08/2016 +0 days 🔍
03/08/2016 +0 days 🔍
03/08/2016 +0 days 🔍
03/09/2016 +1 days 🔍
03/09/2016 +0 days 🔍
03/09/2016 +0 days 🔍
07/09/2022 +2313 days 🔍



Advisory: MS16-034
Researcher: Nils
Organization: Google Project Zero
Status: Confirmed

CVE: CVE-2016-0093 (🔍)
SecurityFocus: 84054 - Microsoft Windows Kernel 'Win32k.sys' CVE-2016-0093 Local Privilege Escalation Vulnerability
SecurityTracker: 1035212
Vulnerability Center: 57106 - [MS16-034] Microsoft Windows Kernel-Mode Drivers Remote Code Execution Vulnerability - CVE-2016-0093, High

scip Labs:
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Created: 03/09/2016 11:20 AM
Updated: 07/09/2022 09:44 PM
Changes: 03/09/2016 11:20 AM (73), 04/07/2017 01:48 PM (19), 07/09/2022 09:34 PM (5), 07/09/2022 09:44 PM (1)
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Cache ID: 44:839:40


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