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CVE-2019-0803

Microsoft Win32k Privilege Escalation Vulnerability

  • High 7.8
  • Exploited: added to CISA KEV 3 Nov 2021
  • Used in ransomware campaigns

Description

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-2019-0859.

Key facts

Published
9 Apr 2019
Last changed
21 Oct 2025
Assigned by
microsoft
KEV added
3 Nov 2021
KEV fix due
3 May 2022
Used in ransomware
Yes, according to CISA
EPSS
45.23% likely to be exploited in the next 30 days, higher than 98.806% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: no; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 7.8CVSS 3.1, Highfrom CISA (ADP container)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

What to do

  • Apply updates per vendor instructions.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
MicrosoftWindows
  • 7 for 32-bit Systems Service Pack 1 (affected)
  • 7 for x64-based Systems Service Pack 1 (affected)
  • 8.1 for 32-bit systems (affected)
  • 8.1 for x64-based systems (affected)
  • RT 8.1 (affected)
  • 10 for 32-bit Systems (affected)
  • 10 for x64-based Systems (affected)
  • 10 Version 1607 for 32-bit Systems (affected)
  • 10 Version 1607 for x64-based Systems (affected)
  • 10 Version 1703 for 32-bit Systems (affected)
  • 10 Version 1703 for x64-based Systems (affected)
  • 10 Version 1709 for 32-bit Systems (affected)
  • 10 Version 1709 for x64-based Systems (affected)
  • 10 Version 1803 for 32-bit Systems (affected)
  • 10 Version 1803 for x64-based Systems (affected)
  • 10 Version 1803 for ARM64-based Systems (affected)
  • 10 Version 1809 for 32-bit Systems (affected)
  • 10 Version 1809 for x64-based Systems (affected)
  • 10 Version 1809 for ARM64-based Systems (affected)
  • 10 Version 1709 for ARM64-based Systems (affected)
MicrosoftWindows Server
  • 2008 R2 for x64-based Systems Service Pack 1 (Core installation) (affected)
  • 2008 R2 for Itanium-Based Systems Service Pack 1 (affected)
  • 2008 R2 for x64-based Systems Service Pack 1 (affected)
  • 2008 for 32-bit Systems Service Pack 2 (Core installation) (affected)
  • 2012 (affected)
  • 2012 (Core installation) (affected)
  • 2012 R2 (affected)
  • 2012 R2 (Core installation) (affected)
  • 2016 (affected)
  • 2016 (Core installation) (affected)
  • version 1709 (Core Installation) (affected)
  • version 1803 (Core Installation) (affected)
  • 2019 (affected)
  • 2019 (Core installation) (affected)
  • 2008 for Itanium-Based Systems Service Pack 2 (affected)
  • 2008 for 32-bit Systems Service Pack 2 (affected)
  • 2008 for x64-based Systems Service Pack 2 (affected)
  • 2008 for x64-based Systems Service Pack 2 (Core installation) (affected)

Timeline

  1. 9 Apr 2019 Published
  2. 3 Nov 2021 CVE-2019-0803 added to CISA KEV
  3. 3 Nov 2021 Added to the CISA KEV catalogue

References