Microsoft Windows
CVE-2019-0733 — Windows Defender Application Control Security Feature Bypass Vulnerability
Executive Summary
A security feature bypass vulnerability exists in Windows Defender Application Control (WDAC) which could allow an attacker to bypass WDAC enforcement. An attacker who successfully exploited this vulnerability could circumvent Windows PowerShell Constrained Language Mode on the machine. To exploit the vulnerability, an attacker would first have to access the local machine, and then place PowerShell into Constrained Language mode. By doing that an attacker could leverage script debugging to abuse signed modules in an unintended way. The update addresses the vulnerability by correcting how PowerShell functions in Constrained Language Mode.
Overview
5.3
CVSS MEDIUM
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
ATTACK VECTOR
Local
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Unchanged
Temporal Score: 4.8
EPSS Score
0.01178
probability of exploitation in the next 30 days
0.63554 percentile - updated 2026-06-20
View on FIRST.org
Affected Products
26 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| PowerShell Core 6.1 | Release Notes (Security Update) |
Important | Security Feature Bypass | Maybe |
| PowerShell Core 6.2 | Release Notes (Security Update) |
Important | Security Feature Bypass | Maybe |
| Windows 10 for 32-bit Systems | 4499154 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 for x64-based Systems | 4499154 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1607 for 32-bit Systems | 4494440 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1607 for x64-based Systems | 4494440 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1703 for 32-bit Systems | 4499181 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1703 for x64-based Systems | 4499181 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1709 for 32-bit Systems | 4499179 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1709 for ARM64-based Systems | 4499179 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1709 for x64-based Systems | 4499179 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1803 for 32-bit Systems | 4499167 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1803 for ARM64-based Systems | 4499167 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1803 for x64-based Systems | 4499167 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1809 for 32-bit Systems | 4494441 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1809 for ARM64-based Systems | 4494441 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1809 for x64-based Systems | 4494441 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1903 for 32-bit Systems | 4497936 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1903 for ARM64-based Systems | 4497936 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1903 for x64-based Systems | 4497936 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server 2016 | 4494440 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server 2016 (Server Core installation) | 4494440 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server 2019 | 4494441 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server 2019 (Server Core installation) | 4494441 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server, version 1803 (Server Core Installation) | 4499167 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server, version 1903 (Server Core installation) | 4497936 (Security Update) |
Important | Security Feature Bypass | Yes |
Patches
8 patches
| Article | Type | Restart |
|---|---|---|
Release Notes |
Security Update | Maybe |
4499154 |
Security Update | Yes |
4494440 |
Security Update | Yes |
4499181 |
Security Update | Yes |
4499179 |
Security Update | Yes |
4499167 |
Security Update | Yes |
4494441 |
Security Update | Yes |
4497936 |
Security Update | Yes |
Known Exploits
No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.
Acknowledgments
References
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