Microsoft Win32k Privilege Escalation Vulnerability

HOCH 7.8EXPLOITED (CISA KEV)CVE-2019-0803 · Published 09/04/2019 · updated 17/06/2026

Microsoft Win32k Privilege Escalation Vulnerability. Actively exploited: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 03/11/2021. Patch affected systems as an emergency. It is known to be used in ransomware campaigns.

Package	Affected versions	Patched versions
Win32k Microsoft	Versions not published yet (product named by CISA KEV)

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.

References

packetstormsecurity.com/files/153034/Microsoft-Windows-Win32k-Privilege-Escalation.html · Third Party Advisory
portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0803 · Patch
cisa.gov/known-exploited-vulnerabilities-catalog · US Government Resource
CISA KEV · CVE-2019-0803

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