What’s Vulnerable › Vulnerabilities

CVE-2023-21809: Microsoft Defender for Endpoint Security Feature Bypass Vulnerability

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-02-14 · updated 2026-08-19

Description

Microsoft Defender for Endpoint Security Feature Bypass Vulnerability

Affected products

• Microsoft Defender Security Intelligence Updates: before 1.379.200.0 — fixed in 1.379.200.0
• Microsoft Defender Security Intelligence Updates: from 1.0.0 before 1.379.200.0 — fixed in 1.379.200.0

How to fix

Upgrade to a fixed version: Microsoft Defender Security Intelligence Updates 1.379.200.0; Microsoft Defender Security Intelligence Updates 1.379.200.0. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21809
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21809

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