Microsoft Windows null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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A vulnerability, which was classified as problematic, was found in Microsoft Windows (Operating System) (affected version not known). This affects some unknown functionality. The manipulation with an unknown input leads to a null pointer dereference vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality. The summary by CVE is:

win32k.sys in the kernel-mode drivers in Microsoft Windows XP SP3 does not properly validate the arguments to functions, which allows local users to read arbitrary data from kernel memory via a crafted application that triggers a NULL pointer dereference, aka "Win32k Incorrect Parameter Validation Allows Information Disclosure Vulnerability."

The weakness was disclosed 07/13/2011 (Website). It is possible to read the advisory at This vulnerability is uniquely identified as CVE-2011-1886 since 05/04/2011. The exploitability is told to be easy. Attacking locally is a requirement. A authentication is required for exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 11/14/2021).

The vulnerability scanner Nessus provides a plugin with the ID 55570 (MS11-054: Vulnerabilities in Windows Kernel-Mode Drivers Could Allow Elevation of Privilege (2555917)), 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 90718 (Microsoft Windows Kernel Mode Drivers Elevation of Privilege (MS11-054)).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at X-Force (68312), Tenable (55570), SecurityFocus (BID 48607†), OSVDB (73791†) and Secunia (SA45186†).






CPE 2.3info

CPE 2.2info


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VulDB Meta Base Score: 3.3
VulDB Meta Temp Score: 3.3

VulDB Base Score: 3.3
VulDB Temp Score: 3.3
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Class: Null pointer dereference
CWE: CWE-476 / CWE-404

Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

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Nessus ID: 55570
Nessus Name: MS11-054: Vulnerabilities in Windows Kernel-Mode Drivers Could Allow Elevation of Privilege (2555917)
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OpenVAS ID: 902538
OpenVAS Name: Windows Kernel-Mode Drivers Privilege Elevation Vulnerabilities (2555917)
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Threat Intelligenceinfo

Interest: 🔍
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Recommended: no mitigation known
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05/04/2011 🔍
07/12/2011 +69 days 🔍
07/12/2011 +0 days 🔍
07/12/2011 +0 days 🔍
07/12/2011 +0 days 🔍
07/13/2011 +1 days 🔍
07/13/2011 +0 days 🔍
07/13/2011 +0 days 🔍
03/23/2015 +1349 days 🔍
11/14/2021 +2428 days 🔍



Status: Confirmed
Confirmation: 🔍

CVE: CVE-2011-1886 (🔍)

X-Force: 68312
SecurityFocus: 48607 - Microsoft Windows Kernel 'Win32k.sys' (CVE-2011-1886) Local Information Disclosure Vulnerability
Secunia: 45186 - Microsoft Windows win32k.sys Driver Multiple Vulnerabilities, Less Critical
OSVDB: 73791
SecurityTracker: 1025761 - Windows Kernel-Mode Drivers Let Local Users Gain Elevated Privileges
Vulnerability Center: 32252 - [MS11-054] Microsoft Windows XP WIN32K.SYS Local Information Disclosure Vulnerability, Low


Created: 03/23/2015 04:50 PM
Updated: 11/14/2021 11:20 AM
Changes: 03/23/2015 04:50 PM (60), 04/07/2017 04:05 PM (19), 11/14/2021 11:20 AM (3)
Complete: 🔍
Cache ID: 3:1FC:40


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