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CVE-2023-21768: Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 65.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-01-10 · updated 2026-06-17
• Weakness: CWE-822

Description

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

Affected products

• Microsoft Windows 11 version 21H2: 21h2, 22h2
• Microsoft Windows Server 2022: all versions
• Microsoft Windows 11 21H2: from 10.0.0 before 10.0.22000.1455 — fixed in 10.0.22000.1455
• Microsoft Windows 11: from 10.0.22621.0 before 10.0.22621.1105 — fixed in 10.0.22621.1105
• Microsoft Windows Server 2022: from 10.0.20348.0 before 10.0.20348.1487 — fixed in 10.0.20348.1487

How to fix

Upgrade to a fixed version: Microsoft Windows 11 21H2 10.0.22000.1455; Microsoft Windows 11 10.0.22621.1105; Microsoft Windows Server 2022 10.0.20348.1487. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21768
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21768

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