CVE-2009-1127
win32k.sys in the kernel in Microsoft Windows 2000 SP4, XP SP2 and SP3, Server 2003 SP2, Vista Gold, SP1, and SP2, and Server 2008 Gold and SP2 does not correctly validate an argument to an unspecified system call, which allows local users to gain…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.55%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
win32k.sys in the kernel in Microsoft Windows 2000 SP4, XP SP2 and SP3, Server 2003 SP2, Vista Gold, SP1, and SP2, and Server 2008 Gold and SP2 does not correctly validate an argument to an unspecified system call, which allows local users to gain privileges via a crafted application that triggers a NULL pointer dereference, aka "Win32k NULL Pointer Dereferencing Vulnerability."
- CVSS 2.0
- 7.2 HIGHAV:L/AC:L/Au:N/C:C/I:C/A:C
- EPSS
- 1.55% probability · 75th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- microsoft/windows 2000 · microsoft/windows 2003 server · microsoft/windows server 2008 · microsoft/windows vista · microsoft/windows xp
- Source
- secure@microsoft.com
EPSS 1.5% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.us-cert.gov/cas/techalerts/TA09-314A.htmlUS Government Resource
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-065
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5588
- http://www.us-cert.gov/cas/techalerts/TA09-314A.htmlUS Government Resource
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-065
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5588
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.