What’s Vulnerable › Vulnerabilities

CVE-2021-43882: Microsoft Defender for IoT Remote Code Execution Vulnerability

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-12-15 · updated 2026-06-17
• Weakness: CWE-295

Description

Microsoft Defender for IoT Remote Code Execution Vulnerability

Affected products

• Microsoft Defender for IoT: before 10.5.3 — fixed in 10.5.3
• Microsoft Defender for IoT: from 22.0.0 before 10.5.3 — fixed in 10.5.3

How to fix

Upgrade to a fixed version: Microsoft Defender for IoT 10.5.3; Microsoft Defender for IoT 10.5.3. Check the vendor advisory for mitigations.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-43882
• https://www.zerodayinitiative.com/advisories/ZDI-21-1553/
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-43882
• https://www.zerodayinitiative.com/advisories/ZDI-21-1553/

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