CVE-2011-1887

CVE-2011-1887 is a high-severity vulnerability in Microsoft Windows 7 with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-476.

Key facts

• Severity: High (CVSS 3.x base score 7.8)
• CVSS v2: 7.2
• EPSS exploit prediction: 1% (64th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-476
• Affected product: Microsoft Windows 7
• Published: 2011-07-13
• Last modified: 2026-06-16

Description

win32k.sys in the kernel-mode drivers in Microsoft Windows Vista SP1 and SP2, Windows Server 2008 Gold, SP2, R2, and R2 SP1, and Windows 7 Gold and SP1 allows local users to gain privileges via a crafted application that triggers a NULL pointer dereference, a different vulnerability than other CVEs listed in MS11-054, aka "Win32k Null Pointer De-reference Vulnerability."

Frequently asked questions

What is CVE-2011-1887?

win32k.sys in the kernel-mode drivers in Microsoft Windows Vista SP1 and SP2, Windows Server 2008 Gold, SP2, R2, and R2 SP1, and Windows 7 Gold and SP1 allows local users to gain privileges via a crafted application that triggers a NULL pointer dereference, a different vulnerability than other CVEs listed in MS11-054, aka "Win32k Null Pointer De-reference Vulnerability."

How severe is CVE-2011-1887?

CVE-2011-1887 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2011-1887 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-1887?

CVE-2011-1887 primarily affects Microsoft Windows 7. In total, 13 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-1887?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2011-1887 published?

CVE-2011-1887 was published on 2011-07-13 and last updated on 2026-06-16.

References

• http://osvdb.org/73789
• http://secunia.com/advisories/45186
• http://support.avaya.com/css/P8/documents/100144947
• http://www.securityfocus.com/bid/48601
• http://www.securitytracker.com/id?1025761
• http://www.us-cert.gov/cas/techalerts/TA11-193A.html
• https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-054
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12711

Affected products (13)

• cpe:2.3:o:microsoft:windows_7:-:*:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_7:-:sp1:x64:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_7:-:sp1:x86:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server_2008:*:*:itanium:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server_2008:*:*:x32:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server_2008:*:*:x64:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server_2008:*:sp2:x32:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server_2008:*:sp2:x64:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server_2008:-:sp2:itanium:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server_2008:r2:*:itanium:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server_2008:r2:*:x64:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_vista:*:sp1:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_vista:*:sp2:*:*:*:*:*:*

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