CVE-2026-21243

HIGH

Windows LDAP - DoS

Title source: llm
STIX 2.1

Description

Null pointer dereference in Windows LDAP - Lightweight Directory Access Protocol allows an unauthorized attacker to deny service over a network.

References (1)

Scores

CVSS v3 7.5
EPSS 0.0009
EPSS Percentile 25.4%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-476
Status published
Products (10)
Microsoft/Windows Server 2019 10.0.17763.0 - 10.0.17763.8389
Microsoft/Windows Server 2019 (Server Core installation) 10.0.17763.0 - 10.0.17763.8389
Microsoft/Windows Server 2022 10.0.20348.0 - 10.0.20348.4773
Microsoft/Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.0 - 10.0.25398.2149
Microsoft/Windows Server 2025 10.0.26100.0 - 10.0.26100.32370
Microsoft/Windows Server 2025 (Server Core installation) 10.0.26100.0 - 10.0.26100.32370
microsoft/windows_server_2019 < 10.0.17763.8389
microsoft/windows_server_2022 < 10.0.20348.4711
microsoft/windows_server_2022_23h2 < 10.0.25398.2149
microsoft/windows_server_2025 < 10.0.26100.32313
Published Feb 10, 2026
Tracked Since Feb 18, 2026