CVE-2020-17090 — Microsoft Defender for Endpoint Security Feature Bypass Vulnerability

Executive Summary

None

Overview

5.3

CVSS MEDIUM

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Security Feature Bypass

Released Nov 10 2020

Last Updated Nov 10 2020

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.03082 — 0.85988 percentile

NVD CVSS 5.3 MEDIUM — matches MSRC

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C

ATTACK VECTOR

Network

ATTACK COMPLEXITY

High

PRIVILEGES REQUIRED

None

USER INTERACTION

Required

SCOPE

Unchanged

CONFIDENTIALITY

High

INTEGRITY

None

AVAILABILITY

None

EXPLOIT CODE MATURITY

Unproven

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 4.6

EPSS Score

0.03082

probability of exploitation in the next 30 days

0.85988 percentile - updated 2026-06-21

View on FIRST.org

Affected Products

23 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows 10 Version 1803 for 32-bit Systems	`4586785 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1803 for ARM64-based Systems	`4586785 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1803 for x64-based Systems	`4586785 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1809 for 32-bit Systems	`4586793 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1809 for ARM64-based Systems	`4586793 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1809 for x64-based Systems	`4586793 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1903 for 32-bit Systems	`4586786 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1903 for ARM64-based Systems	`4586786 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1903 for x64-based Systems	`4586786 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1909 for 32-bit Systems	`4586786 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1909 for ARM64-based Systems	`4586786 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1909 for x64-based Systems	`4586786 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 2004 for 32-bit Systems	`4586781 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 2004 for ARM64-based Systems	`4586781 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 2004 for x64-based Systems	`4586781 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 20H2 for 32-bit Systems	`4586781 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 20H2 for ARM64-based Systems	`4586781 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server 2019	`4586793 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server 2019 (Server Core installation)	`4586793 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server, version 1903 (Server Core installation)	`4586786 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server, version 1909 (Server Core installation)	`4586786 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server, version 2004 (Server Core installation)	`4586781 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server, version 20H2 (Server Core Installation)	`4586781 (Security Update)`	Important	Security Feature Bypass	Yes

Patches

4 patches

Article	Type	Restart
`4586785`	Security Update	Yes
`4586793`	Security Update	Yes
`4586786`	Security Update	Yes
`4586781`	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

Noa Bratman of the Microsoft Defender for Endpoint team

References

MSRC Advisory MITRE NVD