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Microsoft Windows

CVE-2019-0627 — Windows Security Feature Bypass Vulnerability

Important CVSS 5.3 EPSS 0.01349 2019-02 archive

Executive Summary

A security feature bypass vulnerability exists in Windows which could allow an attacker to bypass Device Guard. An attacker who successfully exploited this vulnerability could circumvent a User Mode Code Integrity (UMCI) policy on the machine. To exploit the vulnerability, an attacker would first have to access the local machine, and then run a malicious program. The update addresses the vulnerability by correcting how Windows validates User Mode Code Integrity policies.

Overview

5.3
CVSS MEDIUM
Important
MS Severity
Not Exploited
MS Exploit Status
More Likely
MS Exploit Likelihood
Category Security Feature Bypass
Released Feb 12 2019
Last Updated Feb 12 2019
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.01349 — 0.67846 percentile

CVSS Vector

ATTACK VECTOR
Local
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Unchanged
Temporal Score: 4.8

EPSS Score

0.01349
probability of exploitation in the next 30 days
0.67846 percentile - updated 2026-06-20
View on FIRST.org

Affected Products

23 affected products
Product KB Article Severity Impact Restart Required
PowerShell Core 6.1 Release Notes (Security Update) Important Security Feature Bypass Yes
PowerShell Core 6.2 Release Notes (Security Update) Important Security Feature Bypass Yes
Windows 10 for 32-bit Systems 4487018 (Security Update) Important Security Feature Bypass Yes
Windows 10 for x64-based Systems 4487018 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 1607 for 32-bit Systems 4487026 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 1607 for x64-based Systems 4487026 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 1703 for 32-bit Systems 4487020 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 1703 for x64-based Systems 4487020 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 1709 for 32-bit Systems 4486996 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 1709 for ARM64-based Systems 4486996 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 1709 for x64-based Systems 4486996 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 1803 for 32-bit Systems 4487017 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 1803 for ARM64-based Systems 4487017 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 1803 for x64-based Systems 4487017 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 1809 for 32-bit Systems 4487044 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 1809 for ARM64-based Systems 4487044 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 1809 for x64-based Systems 4487044 (Security Update) Important Security Feature Bypass Yes
Windows Server 2016 4487026 (Security Update) Important Security Feature Bypass Yes
Windows Server 2016 (Server Core installation) 4487026 (Security Update) Important Security Feature Bypass Yes
Windows Server 2019 4487044 (Security Update) Important Security Feature Bypass Yes
Windows Server 2019 (Server Core installation) 4487044 (Security Update) Important Security Feature Bypass Yes
Windows Server, version 1709 (Server Core Installation) 4486996 (Security Update) Important Security Feature Bypass Yes
Windows Server, version 1803 (Server Core Installation) 4487017 (Security Update) Important Security Feature Bypass Yes

Patches

7 patches
Article Type Restart
Release Notes Security Update Yes
4487018 Security Update Yes
4487026 Security Update Yes
4487020 Security Update Yes
4486996 Security Update Yes
4487017 Security Update Yes
4487044 Security Update Yes

Known Exploits

Acknowledgments

SpecterOps

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