CVE-2019-0803

CVE-2019-0803 is a high-severity vulnerability in Microsoft Windows 10 1507 with a CVSS 3.x base score of 7.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2021-11-03).

Key facts

• Severity: High (CVSS 3.x base score 7.8)
• CVSS v2: 7.2
• EPSS exploit prediction: 45% (99th percentile)
• Actively exploited: Yes — listed in CISA KEV (added 2021-11-03)
• EU (EUVD) id: EUVD-2019-1559
• EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2021-11-03)
• Affected product: Microsoft Windows 10 1507
• Published: 2019-04-09
• Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2019-0803?

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.

How severe is CVE-2019-0803?

CVE-2019-0803 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-0803 being actively exploited?

Yes. CVE-2019-0803 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2021-11-03, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2019-0803?

CVE-2019-0803 primarily affects Microsoft Windows 10 1507. In total, 27 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-0803?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2019-0803 have an EU (EUVD) identifier?

Yes. CVE-2019-0803 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2019-1559. It is also flagged as exploited in the EUVD (since 2021-11-03).

When was CVE-2019-0803 published?

CVE-2019-0803 was published on 2019-04-09 and last updated on 2026-06-17.

References

• 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://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-0803

Affected products (27)

• cpe:2.3:o:microsoft:windows_10_1507:-:*:*:*:*:*:x64:*
• cpe:2.3:o:microsoft:windows_10_1507:-:*:*:*:*:*:x86:*
• cpe:2.3:o:microsoft:windows_10_1607:-:*:*:*:*:*:x64:*
• cpe:2.3:o:microsoft:windows_10_1607:-:*:*:*:*:*:x86:*
• cpe:2.3:o:microsoft:windows_10_1703:-:*:*:*:*:*:x64:*
• cpe:2.3:o:microsoft:windows_10_1703:-:*:*:*:*:*:x86:*
• cpe:2.3:o:microsoft:windows_10_1709:-:*:*:*:*:*:arm64:*
• cpe:2.3:o:microsoft:windows_10_1709:-:*:*:*:*:*:x64:*
• cpe:2.3:o:microsoft:windows_10_1709:-:*:*:*:*:*:x86:*
• cpe:2.3:o:microsoft:windows_10_1803:-:*:*:*:*:*:arm64:*
• cpe:2.3:o:microsoft:windows_10_1803:-:*:*:*:*:*:x64:*
• cpe:2.3:o:microsoft:windows_10_1803:-:*:*:*:*:*:x86:*
• cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:arm64:*
• cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:x64:*
• cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:x86:*
• cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server_1709:-:*:*:*:*:*:x64:*
• cpe:2.3:o:microsoft:windows_server_1803:-:*:*:*:*:*:x64:*
• cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:itanium:*
• cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:*
• cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:*

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