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CVE-2024-20671: Microsoft Defender Security Feature Bypass Vulnerability

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-03-12 · updated 2026-06-17
• Weakness: CWE-276

Description

Microsoft Defender Security Feature Bypass Vulnerability

Affected products

• Microsoft Windows Defender Antimalware Platform: before 4.18.24010.12 — fixed in 4.18.24010.12
• Microsoft Windows Defender: from 4.0.0.0 before 4.18.24010.12 — fixed in 4.18.24010.12

How to fix

Upgrade to a fixed version: Microsoft Windows Defender Antimalware Platform 4.18.24010.12; Microsoft Windows Defender 4.18.24010.12. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-20671
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-20671

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