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Unrated severityNVD Advisory· Published Feb 10, 2026· Updated Apr 10, 2026

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

CVE-2026-21243

Description

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

Affected products

6
  • Microsoft/Windows Server 2019v5
    Range: 10.0.17763.0
  • Microsoft/Windows Server 2019 (Server Core installation)v5
    Range: 10.0.17763.0
  • Microsoft/Windows Server 2022v5
    Range: 10.0.20348.0
  • Microsoft/Windows Server 2022, 23H2 Edition (Server Core installation)v5
    Range: 10.0.25398.0
  • Microsoft/Windows Server 2025v5
    Range: 10.0.26100.0
  • Microsoft/Windows Server 2025 (Server Core installation)v5
    Range: 10.0.26100.0

Patches

0

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

References

1

News mentions

0

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