High 7.8Known exploited (CISA KEV)Published Apr 9, 2019

CVE-2019-0859An elevation of privilege vulnerability exists in Windows when the Win32k component fails to properly handle objects in memory, aka 'Win32k Elevation of Privilege Vulnerability'.

Updated under an hour ago (Oct 26, 2026, 11:50 PM ET)

Does this affect you?

It affects Microsoft Windows and 16 other products. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Nov 3, 2021; federal agencies had to remediate by May 3, 2022, and it is known to be used in ransomware. Treat that date as your deadline.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for Microsoft Windows

Exploited in the last 30 days

An elevation of privilege vulnerability exists in Windows when the Win32k component fails to properly handle objects in memory, aka 'Win32k Elevation of Privilege Vulnerability'. This CVE ID is unique from CVE-2019-0685, CVE-2019-0803.

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): Not given
Known exploited: Added to CISA KEV Nov 3, 2021; federal remediation due May 3, 2022; known ransomware useApply updates per vendor instructions.
EPSS (exploitation in the next 30 days): 4.15% (percentile 91)
Assigned by: microsoft
NVD analysis: Analyzed
Record last updated: Oct 21, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Microsoft Windows microsoft:windows (from the name)	7 for 32-bit Systems Service Pack 1; 7 for x64-based Systems Service Pack 1; 8.1 for 32-bit systems; 8.1 for x64-based systems; RT 8.1; 10 for 32-bit Systems; 10 for x64-based Systems; 10 Version 1607 for 32-bit Systems; and 12 more ranges	CNA record
Microsoft Windows Server microsoft:windows_server (from the name)	2008 R2 for x64-based Systems Service Pack 1 (Core installation); 2008 R2 for Itanium-Based Systems Service Pack 1; 2008 R2 for x64-based Systems Service Pack 1; 2008 for 32-bit Systems Service Pack 2 (Core installation); 2012; 2012 (Core installation); 2012 R2; 2012 R2 (Core installation); and 10 more ranges	CNA record
microsoft windows_10_1507 microsoft:windows_10_1507	all versions; all versions	NVD
microsoft windows_10_1607 microsoft:windows_10_1607	all versions; all versions	NVD
microsoft windows_10_1703 microsoft:windows_10_1703	all versions; all versions	NVD
microsoft windows_10_1709 microsoft:windows_10_1709	all versions; all versions; all versions	NVD
microsoft windows_10_1803 microsoft:windows_10_1803	all versions; all versions; all versions	NVD
microsoft windows_10_1809 microsoft:windows_10_1809	all versions; all versions; all versions	NVD
microsoft windows_7 microsoft:windows_7	all versions	NVD
microsoft windows_8.1 microsoft:windows_8.1	all versions	NVD
1–10 of 17

References

References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0859	x-refsource-misc, patch, vendor-advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-0859	us-government-resource

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.