What’s Vulnerable › Vulnerabilities

CVE-2021-42311: Microsoft Defender for IoT Remote Code Execution Vulnerability

• Severity: critical (CVSS 10.0 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 4.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-12-15 · updated 2026-06-17
• Weakness: CWE-89

Description

Microsoft Defender for IoT Remote Code Execution Vulnerability

Affected products

• Microsoft Defender for IoT: before 10.5.2 — fixed in 10.5.2
• Microsoft Defender for IoT: from 22.0.0 before 10.5.2 — fixed in 10.5.2

How to fix

Upgrade to a fixed version: Microsoft Defender for IoT 10.5.2; Microsoft Defender for IoT 10.5.2. Check the vendor advisory for mitigations.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42311
• https://www.zerodayinitiative.com/advisories/ZDI-21-1556/
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42311
• https://www.zerodayinitiative.com/advisories/ZDI-21-1556/

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