# CVE-2019-0803: Microsoft Win32k Privilege Escalation Vulnerability

> CVE-2019-0803: Microsoft Win32k Privilege Escalation Vulnerability. CVSS 7.8 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2019-0803
Last updated: 2025-10-21T23:45:39Z

- Published: 2019-04-09 20:15 UTC · Updated: 2025-10-21 23:45 UTC · Assigner: microsoft
- CVSS: 7.8 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS: 45.2%, 99th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2021-11-03, federal due date 2022-05-03, ransomware use: Known

## 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.

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- Microsoft: Windows
- Microsoft: Windows Server

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2019-0803)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2019-0803)
- [http://packetstormsecurity.com/files/153034/Microsoft-Windows-Win32k-Privilege-Escalation.html](http://packetstormsecurity.com/files/153034/Microsoft-Windows-Win32k-Privilege-Escalation.html)
- [https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0803](https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0803)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2019-0803 · Markdown: https://rewindex.com/cve/CVE-2019-0803.md · JSON: https://rewindex.com/api/v1/cves/CVE-2019-0803 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:01:06.114Z