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Δ / VULNERABILITY RECORD

CVE-2026-21243.

Source-reported disclosure and enrichment record.

SEVERITY / CVSSHIGH / 7.5No severity score in this snapshot.
EXPLOITATION STATUSNot listed in the cached KEV catalogThis does not establish absence of exploitation.
RECORD STATUSMicrosoft vendor recordModified Feb 10, 2026

Disclosure summary

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

Source-reported weakness categories

CWE-476

Source-specific records & product guidance

Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.

Microsoft Security Updates (CVRF) · 2026-Feb

Open original source · Updated Feb 10, 2026

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

Maximum of vendor-reported product scores; products and fixed builds are associations, not a universal affected-version statement.

Microsoft maximum product score: 7.5

VendorProduct / associationVersion / bounds
Microsoft update guideWindows Server 2019 (MSRC status code 3)
Microsoft update guideWindows Server 2019 (Server Core installation) (MSRC status code 3)
Microsoft update guideWindows Server 2022 (MSRC status code 3)
Microsoft update guideWindows Server 2022 (Server Core installation) (MSRC status code 3)
Microsoft update guideWindows Server 2025 (Server Core installation) (MSRC status code 3)
Microsoft update guideWindows Server 2022, 23H2 Edition (Server Core installation) (MSRC status code 3)
Microsoft update guideWindows Server 2025 (MSRC status code 3)

Vendor remediation references

Original records & references

PUBLISHED 2026-02-10T03:00:00-05:00
MODIFIED 2026-02-10T03:00:00-05:00
INGESTED 2026-10-08T12:45:18-04:00