What’s Vulnerable › Vulnerabilities

CVE-2023-38163: Windows Defender Attack Surface Reduction Security Feature Bypass

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-09-12 · updated 2026-06-17

Description

Windows Defender Attack Surface Reduction Security Feature Bypass

Affected products

• Microsoft Windows Defender Security Intelligence Updates: from 1.0.0 before 1.391.1332.0 — fixed in 1.391.1332.0
• Microsoft Defender Security Intelligence Updates: from 1.0.0 before 1.391.1332.0 — fixed in 1.391.1332.0

How to fix

Upgrade to a fixed version: Microsoft Windows Defender Security Intelligence Updates 1.391.1332.0; Microsoft Defender Security Intelligence Updates 1.391.1332.0. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-38163
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-38163

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