CVE-2026-21243

HIGH
2026-02-10 [email protected]
7.5
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 22:02 vuln.today
CVE Published
Feb 10, 2026 - 18:16 nvd
HIGH 7.5

Tags

Windows Ldap Null Pointer Dereference Windows Server 2022 Windows Server 2022 23h2 Windows Server 2019 Windows Server 2025 Microsoft

Description

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

Analysis

Windows LDAP service in Server 2022 and 2022 23H2 is vulnerable to denial of service through a null pointer dereference that can be triggered remotely without authentication. An attacker can exploit this flaw over the network to crash the LDAP service and disrupt directory access functionality. …

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Remediation

Within 24 hours: Inventory all Windows systems running LDAP services and assess exposure; enable enhanced logging on LDAP infrastructure. Within 7 days: Implement network segmentation to restrict LDAP access to authorized systems only; deploy intrusion detection signatures for exploitation attempts. …

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Priority Score

38
Low Medium High Critical
KEV: 0
EPSS: +0.1
CVSS: +38
POC: 0

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CVE-2026-21243 vulnerability details – vuln.today
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