CVE-2024-21356 — Windows Lightweight Directory Access Protocol (LDAP) Denial of Service Vulnerability

Executive Summary

None

Overview

6.5

CVSS MEDIUM

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Denial of Service

Released Feb 13 2024

Last Updated Feb 13 2024

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.02079 — 0.79056 percentile

NVD CVSS 6.5 MEDIUM — matches MSRC

CVSS Vector

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

ATTACK VECTOR

Network

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

Low

USER INTERACTION

None

SCOPE

Unchanged

CONFIDENTIALITY

None

INTEGRITY

None

AVAILABILITY

High

EXPLOIT CODE MATURITY

Unproven

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 5.7

EPSS Score

0.02079

probability of exploitation in the next 30 days

0.79056 percentile - updated 2026-06-21

View on FIRST.org

Affected Products

30 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows 10 for 32-bit Systems	`5034774 (Security Update)`	Important	Denial of Service	Yes
Windows 10 for x64-based Systems	`5034774 (Security Update)`	Important	Denial of Service	Yes
Windows 10 Version 1607 for 32-bit Systems	`5034767 (Security Update)`	Important	Denial of Service	Yes
Windows 10 Version 1607 for x64-based Systems	`5034767 (Security Update)`	Important	Denial of Service	Yes
Windows 10 Version 1809 for 32-bit Systems	`5034768 (Security Update)`	Important	Denial of Service	Yes
Windows 10 Version 1809 for ARM64-based Systems	`5034768 (Security Update)`	Important	Denial of Service	Yes
Windows 10 Version 1809 for x64-based Systems	`5034768 (Security Update)`	Important	Denial of Service	Yes
Windows 10 Version 21H2 for 32-bit Systems	`5034763 (Security Update)`	Important	Denial of Service	Yes
Windows 10 Version 21H2 for ARM64-based Systems	`5034763 (Security Update)`	Important	Denial of Service	Yes
Windows 10 Version 21H2 for x64-based Systems	`5034763 (Security Update)`	Important	Denial of Service	Yes
Windows 10 Version 22H2 for 32-bit Systems	`5034763 (Security Update)`	Important	Denial of Service	Yes
Windows 10 Version 22H2 for ARM64-based Systems	`5034763 (Security Update)`	Important	Denial of Service	Yes
Windows 10 Version 22H2 for x64-based Systems	`5034763 (Security Update)`	Important	Denial of Service	Yes
Windows 11 version 21H2 for ARM64-based Systems	`5034766 (Security Update)`	Important	Denial of Service	Yes
Windows 11 version 21H2 for x64-based Systems	`5034766 (Security Update)`	Important	Denial of Service	Yes
Windows 11 Version 22H2 for ARM64-based Systems	`5034765 (Security Update)`	Important	Denial of Service	Yes
Windows 11 Version 22H2 for x64-based Systems	`5034765 (Security Update)`	Important	Denial of Service	Yes
Windows 11 Version 23H2 for ARM64-based Systems	`5034765 (Security Update)`	Important	Denial of Service	Yes
Windows 11 Version 23H2 for x64-based Systems	`5034765 (Security Update)`	Important	Denial of Service	Yes
Windows Server 2008 for 32-bit Systems Service Pack 2 5034795 (Monthly Rollup) 5034833 (Security Only) Important Denial of Service 5034173 Base: 6.5 Temporal: 5.7 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C 6.0.6003.22511 Yes 5034795 5034833 Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) 5034795 (Monthly Rollup) 5034833 (Security Only) Important Denial of Service 5034173 Base: 6.5 Temporal: 5.7 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C 6.0.6003.22511 Yes 5034795 5034833 Windows Server 2008 for x64-based Systems Service Pack 2 5034795 (Monthly Rollup) 5034833 (Security Only) Important Denial of Service 5034173 Base: 6.5 Temporal: 5.7 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C 6.0.6003.22511 Yes 5034795 5034833 Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 5034795 (Monthly Rollup) 5034833 (Security Only) Important Denial of Service 5034173 Base: 6.5 Temporal: 5.7 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C 6.0.6003.22511 Yes 5034795 5034833 Windows Server 2008 R2 for x64-based Systems Service Pack 1 5034831 (Monthly Rollup) 5034809 (Security Only) Important Denial of Service 5034169 Base: 6.5 Temporal: 5.7 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C 6.1.7601.26961 Yes None Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 5034831 (Monthly Rollup) 5034809 (Security Only) Important Denial of Service 5034169 Base: 6.5 Temporal: 5.7 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C 6.1.7601.26961 Yes None Windows Server 2012	`5034830 (Monthly Rollup)`	Important	Denial of Service	Yes
Windows Server 2012 (Server Core installation)	`5034830 (Monthly Rollup)`	Important	Denial of Service	Yes
Windows Server 2012 R2	`5034819 (Monthly Rollup)`	Important	Denial of Service	Yes
Windows Server 2012 R2 (Server Core installation)	`5034819 (Monthly Rollup)`	Important	Denial of Service	Yes
Windows Server 2016	`5034767 (Security Update)`	Important	Denial of Service	Yes
Windows Server 2016 (Server Core installation)	`5034767 (Security Update)`	Important	Denial of Service	Yes
Windows Server 2019	`5034768 (Security Update)`	Important	Denial of Service	Yes
Windows Server 2019 (Server Core installation)	`5034768 (Security Update)`	Important	Denial of Service	Yes
Windows Server 2022	`5034770 (Security Update)`	Important	Denial of Service	Yes
Windows Server 2022 (Server Core installation)	`5034770 (Security Update)`	Important	Denial of Service	Yes
Windows Server 2022, 23H2 Edition (Server Core installation)	`5034769 (Security Update)`	Important	Denial of Service	Yes

Patches

10 patches

Article	Type	Restart
`5034774`	Security Update	Yes
`5034767`	Security Update	Yes
`5034768`	Security Update	Yes
`5034763`	Security Update	Yes
`5034766`	Security Update	Yes
`5034765`	Security Update	Yes
`5034830`	Monthly Rollup	Yes
`5034819`	Monthly Rollup	Yes
`5034770`	Security Update	Yes
`5034769`	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

Microsoft Offensive Research & Security Engineering

References

MSRC Advisory MITRE NVD