Microsoft Windows null pointer dereference

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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A vulnerability was found in Microsoft Windows (Operating System) (affected version not known) and classified as critical. This issue affects some unknown functionality. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is confidentiality, integrity, and availability.

The weakness was released 04/12/2011 by Tarjei Mandt with Norman (Website). The advisory is shared at The identification of this vulnerability is CVE-2011-1231. The exploitation is known to be easy. An attack has to be approached locally. A simple authentication is required for exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 11/02/2021).

The vulnerability scanner Nessus provides a plugin with the ID 53391 (MS11-034: Vulnerabilities in Windows Kernel-Mode Drivers Could Allow Elevation of Privilege (2506223)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows : Microsoft Bulletins.

A possible mitigation has been published before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (66413) and Tenable (53391). Entries connected to this vulnerability are available at 4336, 54584, 56176 and 56475.






CPE 2.3info

CPE 2.2info


VulDB Meta Base Score: 8.8
VulDB Meta Temp Score: 8.8

VulDB Base Score: 8.8
VulDB Temp Score: 8.8
VulDB Vector: 🔍
VulDB Reliability: 🔍



VulDB Base Score: 🔍
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NVD Base Score: 🔍


Class: Null pointer dereference
CWE: CWE-476 / CWE-404
ATT&CK: Unknown

Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍


Nessus ID: 53391
Nessus Name: MS11-034: Vulnerabilities in Windows Kernel-Mode Drivers Could Allow Elevation of Privilege (2506223)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

OpenVAS ID: 900283
OpenVAS Name: Windows Kernel-Mode Drivers Privilege Elevation Vulnerabilities (2506223)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍


Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍


03/04/2011 🔍
04/12/2011 +39 days 🔍
04/12/2011 +0 days 🔍
04/12/2011 +0 days 🔍
04/12/2011 +0 days 🔍
04/12/2011 +0 days 🔍
04/13/2011 +0 days 🔍
04/13/2011 +0 days 🔍
03/23/2015 +1440 days 🔍
11/02/2021 +2416 days 🔍



Researcher: Tarjei Mandt
Organization: Norman
Status: Not defined
Confirmation: 🔍

CVE: CVE-2011-1231 (🔍)

X-Force: 66413
Vulnerability Center: 31065 - [MS11-034] Microsoft Windows Win32k Null Pointer Dereference Privilege Escalation (CVE-2011-1231), High
SecurityFocus: 47231 - Microsoft Windows Kernel 'Win32k.sys' (CVE-2011-1231) Local Privilege Escalation Vulnerability
Secunia: 44156
OSVDB: 71737 - Microsoft Windows win32k.sys Driver Null Pointer De-reference Unspecified Local Privilege Escalation (2011-1231)

See also: 🔍


Created: 03/23/2015 04:50 PM
Updated: 11/02/2021 02:16 PM
Changes: 03/23/2015 04:50 PM (61), 04/07/2017 04:04 PM (10), 11/02/2021 02:11 PM (5), 11/02/2021 02:16 PM (1)
Complete: 🔍


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