CVE-2026-21243

EUVD-2026-7317
Null pointer dereference in Windows LDAP - Lightweight Directory Access Protocol allows an unauthorized attacker to deny service over a network.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
microsoftCNA
7.5 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
Base Score
CVSS 3.x
EPSS Score
Percentile: 15%
Affected Products (NVD)
VendorProductVersion
microsoftwindows_server_2019
𝑥
< 10.0.17763.8389
microsoftwindows_server_2022
𝑥
< 10.0.20348.4711
microsoftwindows_server_2022_23h2
𝑥
< 10.0.25398.2149
microsoftwindows_server_2025
𝑥
< 10.0.26100.32313
𝑥
= Vulnerable software versions
Windows Releases
Platform
Version
Windows Server 2019
Server Core
KB5075904
Standard
KB5075904
Windows Server 2022
23H2 Server Core
KB5075897
Server Core
KB5075943
Standard
KB5075943
Windows Server 2025
Server Core
KB5075942
Standard
KB5075942
Common Weakness Enumeration
References
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21243