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

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-02-13 · updated 2026-08-10
Weakness: CWE-476

Description

Windows Lightweight Directory Access Protocol (LDAP) Denial of Service Vulnerability

Affected products

Microsoft Windows 10 Version 1507: before 10.0.10240.20469 — fixed in 10.0.10240.20469
Microsoft Windows 10 1607: before 10.0.14393.6709 — fixed in 10.0.14393.6709
Microsoft Windows 10: before 10.0.17763.5458 — fixed in 10.0.17763.5458
Microsoft Windows 10: before 10.0.19044.4046 — fixed in 10.0.19044.4046
Microsoft Windows 10: before 10.0.19045.4046 — fixed in 10.0.19045.4046
Microsoft Windows 11 21H2: before 10.0.22000.2777 — fixed in 10.0.22000.2777
Microsoft Windows 11: before 10.0.22621.3155 — fixed in 10.0.22621.3155
Microsoft Windows 11: before 10.0.22631.3155 — fixed in 10.0.22631.3155
Microsoft Windows Server 2008: r2-sp1
Microsoft Windows Server 2012: r2
Microsoft Windows Server 2016: before 10.0.14393.6709 — fixed in 10.0.14393.6709
Microsoft Windows Server 2019: before 10.0.17763.5458 — fixed in 10.0.17763.5458
Microsoft Windows Server 2022: before 10.0.20348.2322 — fixed in 10.0.20348.2322
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): before 10.0.25398.709 — fixed in 10.0.25398.709
Microsoft Windows 10 Version 1507: from 10.0.10240.0 before 10.0.10240.20469 — fixed in 10.0.10240.20469
Microsoft Windows 10 1607: from 10.0.14393.0 before 10.0.14393.6709 — fixed in 10.0.14393.6709
Microsoft Windows 10: from 10.0.17763.0 before 10.0.17763.5458 — fixed in 10.0.17763.5458
Microsoft Windows 10: from 10.0.19043.0 before 10.0.19044.4046 — fixed in 10.0.19044.4046
Microsoft Windows 10: from 10.0.19045.0 before 10.0.19045.4046 — fixed in 10.0.19045.4046
Microsoft Windows 11 21H2: from 10.0.0 before 10.0.22000.2777 — fixed in 10.0.22000.2777
Microsoft Windows 11: from 10.0.22621.0 before 10.0.22621.3155 — fixed in 10.0.22621.3155
Microsoft Windows 11 version 22H3: from 10.0.22631.0 before 10.0.22631.3155 — fixed in 10.0.22631.3155
Microsoft Windows 11: from 10.0.22631.0 before 10.0.22631.3155 — fixed in 10.0.22631.3155
Microsoft Windows Server 2008 R2 Service Pack 1: from 6.1.7601.0 before 6.1.7601.26961 — fixed in 6.1.7601.26961
Microsoft Windows Server 2008 Service Pack 2: from 6.0.6003.0 before 6.0.6003.22511 — fixed in 6.0.6003.22511
Microsoft Windows Server 2012: from 6.2.9200.0 before 6.2.9200.24710 — fixed in 6.2.9200.24710
Microsoft Windows Server 2012 R2: from 6.3.9600.0 before 6.3.9600.21813 — fixed in 6.3.9600.21813
Microsoft Windows Server 2016: from 10.0.14393.0 before 10.0.14393.6709 — fixed in 10.0.14393.6709
Microsoft Windows Server 2019: from 10.0.17763.0 before 10.0.17763.5458 — fixed in 10.0.17763.5458
Microsoft Windows Server 2022: from 10.0.20348.0 before 10.0.20348.2322 — fixed in 10.0.20348.2322

How to fix

Upgrade to a fixed version: Microsoft Windows 10 Version 1507 10.0.10240.20469; Microsoft Windows 10 1607 10.0.14393.6709; Microsoft Windows 10 10.0.17763.5458; Microsoft Windows 10 10.0.19044.4046; Microsoft Windows 10 10.0.19045.4046; Microsoft Windows 11 21H2 10.0.22000.2777; Microsoft Windows 11 10.0.22621.3155; Microsoft Windows 11 10.0.22631.3155; Microsoft Windows Server 2016 10.0.14393.6709; Microsoft Windows Server 2019 10.0.17763.5458; Microsoft Windows Server 2022 10.0.20348.2322; Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.709. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2024-21356 or the next vulnerability affects your stack