High 7.8Known exploited (CISA KEV)Published Dec 3, 2010

CVE-2010-4398Stack-based buffer overflow in the RtlQueryRegistryValues function in win32k.sys in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP1 and SP2, Windows Server 2008 Gold, SP2…

Updated under an hour ago (2026-10-19 05:50 UTC)

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It affects microsoft windows_7 and 4 other products. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Mar 28, 2022; federal agencies had to remediate by Apr 21, 2022. Treat that date as your deadline.

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Exploited in the last 30 days

Stack-based buffer overflow in the RtlQueryRegistryValues function in win32k.sys in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP1 and SP2, Windows Server 2008 Gold, SP2, and R2, and Windows 7 allows local users to gain privileges, and bypass the User Account Control (UAC) feature, via a crafted REG_BINARY value for a SystemDefaultEUDCFont registry key, aka "Driver Improper Interaction with Windows Kernel Vulnerability."

CVSS: 7.8 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-787
Known exploited: Added to CISA KEV Mar 28, 2022; federal remediation due Apr 21, 2022Apply updates per vendor instructions.
EPSS (exploitation in the next 30 days): 8.66% (percentile 95)
Assigned by: mitre
NVD analysis: Analyzed
Record last updated: Oct 22, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

microsoft windows_7 microsoft:windows_7	all versions	NVD
microsoft windows_server_2003 microsoft:windows_server_2003	all versions	NVD
microsoft windows_server_2008 microsoft:windows_server_2008	all versions; all versions; r2	NVD
microsoft windows_vista microsoft:windows_vista	all versions; all versions	NVD
microsoft windows_xp microsoft:windows_xp	all versions; all versions	NVD

References

http://isc.sans.edu/diary.html?storyid=9988x-refsource-misc, exploit, issue-tracking
http://www.securityfocus.com/bid/45045vdb-entry, x-refsource-bid, broken-link, third-party-advisory
http://www.exploit-db.com/exploits/15609/exploit, x-refsource-exploit-db, third-party-advisory, vdb-entry
http://nakedsecurity.sophos.com/2010/11/25/new-windows-zero-day-flaw-bypasses-uac/x-refsource-misc, broken-link
http://support.avaya.com/css/P8/documents/100127248x-refsource-confirm, third-party-advisory
http://www.vupen.com/english/advisories/2011/0324vdb-entry, x-refsource-vupen, broken-link
http://www.exploit-db.com/bypassing-uac-with-user-privilege-under-windows-vista7-mirror/x-refsource-misc, broken-link, exploit, third-party-advisory, vdb-entry
http://twitter.com/msftsecresponse/statuses/7590788200402945x-refsource-misc, not-applicable
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-011vendor-advisory, x-refsource-ms, patch
http://www.securitytracker.com/id?1025046vdb-entry, x-refsource-sectrack, broken-link, third-party-advisory
http://www.kb.cert.org/vuls/id/529673third-party-advisory, x-refsource-cert-vn, us-government-resource
http://secunia.com/advisories/42356third-party-advisory, x-refsource-secunia, broken-link, vendor-advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12162vdb-entry, signature, x-refsource-oval, broken-link
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2010-4398us-government-resource

The CVE record on cve.org NVD's entry

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