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Highest advisory severityHigh 1 vendor · 1 advisory

CVE-2026-21243

CVE-2026-21243: 1 tracked advisory record across MS Server. Compare vendor sources and published fix guidance.

Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.

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Vendor advisory comparison

MS Server

1 advisory
  • Advisory severityHigh7.5

    High [CVE-2026-21243] Windows Lightweight Directory Access Protocol (LDAP) Denial of Service Vulnerability

    CVE-2026-21243Source published Source updated

    Null pointer dereference in Windows LDAP - Lightweight Directory Access Protocol allows an unauthorized attacker to deny service over a network. Affected products named by the advisory: Windows Server 2019; Windows Server 2019 (Server Core installation); Windows Server 2022; Windows Server 2022, 23H2 Edition (Server Core installation); and 2 more. Affected products named by the advisory: Windows Server 2025 (Server Core installation).

    Affected products in this advisory
    • Windows Server 2019 (Server Core installation)
    • Windows Server 2022, 23H2 Edition (Server Core installation)
    • Windows Server 2025 (Server Core installation)
    Source-reported affected versions
    • Windows Server 2019 10.0.17763.0 before 10.0.17763.8389
    • Windows Server 2019 (Server Core installation) 10.0.17763.0 before 10.0.17763.8389
    • Windows Server 2022 10.0.20348.0 before 10.0.20348.4773
    • Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.0 before 10.0.25398.2149

    2 more entries in the full advisory.

    Source-reported fixed versions
    • 10.0.17763.8389
    • 10.0.20348.4773
    • 10.0.25398.2149
    • 10.0.26100.32370
    Mitigation guidance
    No mitigation guidance extracted; consult the source.
    Full advisory and evidenceOpen source bulletin

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