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CVE-2025-47978: Windows Kerberos Denial of Service Vulnerability

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-07-08 · updated 2026-06-17
• Weakness: CWE-125

Description

Out-of-bounds read in Windows Kerberos allows an authorized attacker to deny service over a network.

Affected products

• Microsoft Windows Server 2022: before 10.0.20348.3932 — fixed in 10.0.20348.3932
• Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): before 10.0.25398.1732 — fixed in 10.0.25398.1732
• Microsoft Windows Server 2025: before 10.0.26100.4652 — fixed in 10.0.26100.4652
• Microsoft Windows Server 2022: from 10.0.20348.0 before 10.0.20348.3932 — fixed in 10.0.20348.3932
• Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): from 10.0.25398.0 before 10.0.25398.1732 — fixed in 10.0.25398.1732
• Microsoft Windows Server 2025: from 10.0.26100.0 before 10.0.26100.4652 — fixed in 10.0.26100.4652

How to fix

Upgrade to a fixed version: Microsoft Windows Server 2022 10.0.20348.3932; Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.1732; Microsoft Windows Server 2025 10.0.26100.4652; Microsoft Windows Server 2022 10.0.20348.3932; Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.1732; Microsoft Windows Server 2025 10.0.26100.4652. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-47978

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