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CVE-2019-0863: Microsoft Windows Error Reporting (WER) Privilege Escalation Vulnerability

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2021-11-03
• EPSS: 5.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-05-16 · updated 2026-06-17

Description

An elevation of privilege vulnerability exists in the way Windows Error Reporting (WER) handles files, aka 'Windows Error Reporting Elevation of Privilege Vulnerability'.

Affected products

• Microsoft Windows 10 Version 1507: all versions
• Microsoft Windows 10 1607: all versions
• Microsoft Corporation Windows 10 1703: all versions
• Microsoft Windows 10 1709: all versions
• Microsoft Windows 10 1803: all versions
• Microsoft Windows 10: all versions
• Microsoft Windows 10 1903: all versions
• Microsoft Windows 7: all versions
• Microsoft Windows 8.1: all versions
• Microsoft Windows RT 8.1: all versions
• Microsoft Windows Server 1803: all versions
• Microsoft Windows Server 1903: all versions
• Microsoft Windows Server 2008: r2-sp1
• Microsoft Windows Server 2012: r2
• Microsoft Windows Server 2016: all versions
• Microsoft Windows Server 2019: all versions
• Microsoft Corporation Windows: 7 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 (+14)
• Microsoft Windows 10 Version 1903 for 32-bit Systems: all versions
• Microsoft Windows 10 Version 1903 for ARM64-based Systems: all versions
• Microsoft Windows 10 Version 1903 for x64-based Systems: all versions
• Microsoft Windows Server: 2008 R2 for x64-based Systems Service Pack 1 (Core installation), 2008 R2 for Itanium-Based Systems Service Pack 1, 2008 R2 for x64-based Systems Service Pack 1, 2012, 2012 (Core installation), 2012 R2 (+6)
• Microsoft Windows Server, version 1903 (Server Core installation): all versions

References

• http://packetstormsecurity.com/files/153008/Angry-Polar-Bear-2-Microsoft-Windows-Error-Reporting-Local-Privilege-Escalation.html
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0863
• http://packetstormsecurity.com/files/153008/Angry-Polar-Bear-2-Microsoft-Windows-Error-Reporting-Local-Privilege-Escalation.html
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0863
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-0863

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