OnlyPatch
Microsoft Windows

CVE-2019-0732 — Windows Security Feature Bypass Vulnerability

Important CVSS 7.8 EPSS 0.03776 2019-04 archive

Executive Summary

A security feature bypass vulnerability exists in Windows which could allow an attacker to bypass Device Guard when Windows improperly handles calls to the LUAFV driver (luafv.sys). 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

7.8
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
More Likely
MS Exploit Likelihood
Category Security Feature Bypass
Released Apr 9 2019
Last Updated Apr 9 2019
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.03776 — 0.88817 percentile
NVD CVSS 7.8 HIGH — differs from MSRC

CVSS Vector

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
ATTACK VECTOR
Local
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
Low
INTEGRITY
Low
AVAILABILITY
Low
EXPLOIT CODE MATURITY
Proof-of-Concept
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 4.8

EPSS Score

0.03776
probability of exploitation in the next 30 days
0.88817 percentile - updated 2026-07-25
View on FIRST.org

Affected Products

22 affected products
Product KB Article Severity Impact Restart Required
Windows 10 for 32-bit Systems 4493475 (Security Update) Important Security Feature Bypass Yes
Windows 10 for x64-based Systems 4493475 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 1607 for 32-bit Systems 4493470 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 1607 for x64-based Systems 4493470 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 1703 for 32-bit Systems 4493474 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 1703 for x64-based Systems 4493474 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 1709 for 32-bit Systems 4493441 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 1709 for ARM64-based Systems 4493441 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 1709 for x64-based Systems 4493441 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 1803 for 32-bit Systems 4493464 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 1803 for ARM64-based Systems 4493464 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 1803 for x64-based Systems 4493464 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 1809 for 32-bit Systems 4493509 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 1809 for ARM64-based Systems 4493509 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 1809 for x64-based Systems 4493509 (Security Update) Important Security Feature Bypass Yes
Windows 7 for 32-bit Systems Service Pack 1 4493472 (Monthly Rollup) 4493448 (Security Only) Important Security Feature Bypass 4489878 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C Yes None Windows 7 for x64-based Systems Service Pack 1 4493472 (Monthly Rollup) 4493448 (Security Only) Important Security Feature Bypass 4489878 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C Yes None Windows 8.1 for 32-bit systems 4493446 (Monthly Rollup) 4493467 (Security Only) Important Security Feature Bypass 4489881 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C Yes None Windows 8.1 for x64-based systems 4493446 (Monthly Rollup) 4493467 (Security Only) Important Security Feature Bypass 4489881 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C Yes None Windows RT 8.1 4493446 (Monthly Rollup) Important Security Feature Bypass Yes
Windows Server 2008 for 32-bit Systems Service Pack 2 4493471 (Monthly Rollup) 4493458 (Security Only) Important Security Feature Bypass 4489880 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C Yes None Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) 4493471 (Monthly Rollup) 4493458 (Security Only) Important Security Feature Bypass 4489880 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C Yes None Windows Server 2008 for Itanium-Based Systems Service Pack 2 4493471 (Monthly Rollup) 4493458 (Security Only) Important Security Feature Bypass 4489880 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C Yes None Windows Server 2008 for x64-based Systems Service Pack 2 4493471 (Monthly Rollup) 4493458 (Security Only) Important Security Feature Bypass 4489880 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C Yes None Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 4493471 (Monthly Rollup) 4493458 (Security Only) Important Security Feature Bypass 4489880 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C Yes None Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1 4493472 (Monthly Rollup) 4493448 (Security Only) Important Security Feature Bypass 4489878 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C Yes None Windows Server 2008 R2 for x64-based Systems Service Pack 1 4493472 (Monthly Rollup) 4493448 (Security Only) Important Security Feature Bypass 4489878 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C Yes None Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 4493472 (Monthly Rollup) 4493448 (Security Only) Important Security Feature Bypass 4489878 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C Yes None Windows Server 2012 4493451 (Monthly Rollup) 4493450 (Security Only) Important Security Feature Bypass 4489891 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C Yes None Windows Server 2012 (Server Core installation) 4493451 (Monthly Rollup) 4493450 (Security Only) Important Security Feature Bypass 4489891 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C Yes None Windows Server 2012 R2 4493446 (Monthly Rollup) 4493467 (Security Only) Important Security Feature Bypass 4489881 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C Yes None Windows Server 2012 R2 (Server Core installation) 4493446 (Monthly Rollup) 4493467 (Security Only) Important Security Feature Bypass 4489881 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C Yes None Windows Server 2016 4493470 (Security Update) Important Security Feature Bypass Yes
Windows Server 2016 (Server Core installation) 4493470 (Security Update) Important Security Feature Bypass Yes
Windows Server 2019 4493509 (Security Update) Important Security Feature Bypass Yes
Windows Server 2019 (Server Core installation) 4493509 (Security Update) Important Security Feature Bypass Yes
Windows Server, version 1709 (Server Core Installation) 4493441 (Security Update) Important Security Feature Bypass Yes
Windows Server, version 1803 (Server Core Installation) 4493464 (Security Update) Important Security Feature Bypass Yes

Patches

7 patches
Article Type Restart
4493475 Security Update Yes
4493470 Security Update Yes
4493474 Security Update Yes
4493441 Security Update Yes
4493464 Security Update Yes
4493509 Security Update Yes
4493446 Monthly Rollup Yes

Known Exploits

Acknowledgments

James Forshaw of Google Project Zero

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