7.8

CVE-2019-0803: Microsoft Win32k Privilege Escalation Vulnerability

CVSS: 7.8v3.1HighKEVRansomwareAnalyzed
Published 09-04-2019Last modified 21-10-2025
Open JSON

Vulnerability summary

CVE-2019-0803 is a high (CVSS 7.8) vulnerability in Microsoft Win32k. It is known to be exploited: CISA lists it, first on 03-11-2021. It has been used in ransomware campaigns. EPSS estimates a 45.23% chance of exploitation in the next 30 days, higher than 98.7% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
90/100
0100
Critical · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
45.23%
0%100%
High · +0.28 pp in 30 days
KEVListedCISA
RansomwareKnown useFlagged by CISA
Public exploits1exploit-database

Timeline

  1. 09-04-2019
    PublishedVulnerability first disclosed.
  2. 03-11-2021
    Added to CISA KEVMicrosoft Win32k Privilege Escalation Vulnerability
  3. 03-05-2022
    CISA remediation dueApply updates per vendor instructions.
  4. 21-10-2025
    Last modifiedVulnerability information updated.

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.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

45.23%

Chance of exploitation in the next 30 days

Percentile

99%

Versus all other CVEs

30-day change

+0.28 pp

From 44.95% on 19-09-2026

19-09-202619-10-2026
EPSS score
45.23%

Known exploited

Compare KEV catalogs
CISA KEVListed
Added
03-11-2021
Federal due date
03-05-2022
Ransomware

CISA required action

Apply updates per vendor instructions. nvd.nist.gov/vuln/detail/CVE-2019-0803

Public exploits

1 found
  • exploit-databaselocalwindowsUnverified

    Microsoft Windows - 'Win32k' Local Privilege Escalation

    Maturity: poc

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Microsoft17 products
  • windowsEOL7 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 | 10 Version 1607 for x64-based Systems | 10 Version 1703 for 32-bit Systems | 10 Version 1703 for x64-based Systems | 10 Version 1709 for 32-bit Systems | 10 Version 1709 for x64-based Systems | 10 Version 1803 for 32-bit Systems | 10 Version 1803 for x64-based Systems | 10 Version 1803 for ARM64-based Systems | 10 Version 1809 for 32-bit Systems | 10 Version 1809 for x64-based Systems | 10 Version 1809 for ARM64-based Systems | 10 Version 1709 for ARM64-based Systems
  • windows_10_1507na
  • windows_10_1607na
  • windows_10_1703na
  • windows_10_1709na

1 vendor · 17 products

References

3 links