CVE-2021-41337 — Active Directory Security Feature Bypass Vulnerability

Executive Summary

None

Overview

4.9

CVSS MEDIUM

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Security Feature Bypass

Released Oct 12 2021

Last Updated Oct 12 2021

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.01547 — 0.71765 percentile

NVD CVSS 4.9 MEDIUM — matches MSRC

CVSS Vector

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

ATTACK VECTOR

Network

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

High

USER INTERACTION

None

SCOPE

Unchanged

CONFIDENTIALITY

None

INTEGRITY

High

AVAILABILITY

None

EXPLOIT CODE MATURITY

Unproven

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 4.3

EPSS Score

0.01547

probability of exploitation in the next 30 days

0.71765 percentile - updated 2026-06-21

View on FIRST.org

Affected Products

8 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows Server 2016	`5006669 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server 2016 (Server Core installation)	`5006669 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server 2019	`5006672 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server 2019 (Server Core installation)	`5006672 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server 2022	`5006699 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server 2022 (Server Core installation)	`5006699 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server, version 2004 (Server Core installation)	`5006670 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server, version 20H2 (Server Core Installation)	`5006670 (Security Update)`	Important	Security Feature Bypass	Yes

Patches

4 patches

Article	Type	Restart
`5006669`	Security Update	Yes
`5006672`	Security Update	Yes
`5006699`	Security Update	Yes
`5006670`	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

Jean-Baptiste Galet working with ANSSI

References

MSRC Advisory MITRE NVD