CVE-2026-21243
Analyzed
Analyzed - Analysis Complete
Null Pointer Dereference in Windows LDAP Causes DoS Attack
Publication date: 2026-02-10
Last updated on: 2026-02-11
Assigner: Microsoft Corporation
Description
Description
Null pointer dereference in Windows LDAP - Lightweight Directory Access Protocol allows an unauthorized attacker to deny service over a network.
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| microsoft | windows_server_2019 | to 10.0.17763.8389 (exc) |
| microsoft | windows_server_2022 | to 10.0.20348.4711 (exc) |
| microsoft | windows_server_2025 | to 10.0.26100.32313 (exc) |
| microsoft | windows_server_2022_23h2 | to 10.0.25398.2149 (exc) |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-476 | The product dereferences a pointer that it expects to be valid but is NULL. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is a null pointer dereference in the Windows LDAP (Lightweight Directory Access Protocol) component.
It allows an unauthorized attacker to cause a denial of service over a network by exploiting this flaw.
How can this vulnerability impact me? :
The vulnerability can be exploited by an unauthorized attacker to cause a denial of service (DoS) condition.
This means that affected Windows LDAP services could become unavailable, disrupting network operations that rely on LDAP.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
I don't know
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