How severe is CVE-2021-42312?

CVE-2021-42312 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-42312 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-42312?

CVE-2021-42312 affects Microsoft Defender For Iot. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-42312?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-42312 published?

CVE-2021-42312 was published on 2021-12-15 and last updated on 2026-06-17.

CVE-2021-42312

CVE-2021-42312 is a high-severity vulnerability in Microsoft Defender For Iot with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 4.6
EPSS exploit prediction: 1% (42nd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Defender For Iot
Published: 2021-12-15
Last modified: 2026-06-17

Description

Microsoft Defender for IoT Elevation of Privilege Vulnerability

Frequently asked questions

What is CVE-2021-42312?: Microsoft Defender for IoT Elevation of Privilege Vulnerability
How severe is CVE-2021-42312?: CVE-2021-42312 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-42312 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-42312?: CVE-2021-42312 affects Microsoft Defender For Iot. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-42312?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-42312 published?: CVE-2021-42312 was published on 2021-12-15 and last updated on 2026-06-17.

References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42312

Affected products (1)

cpe:2.3:a:microsoft:defender_for_iot:*:*:*:*:*:*:*:*

More vulnerabilities in Microsoft Defender For Iot

CVE-2021-42313 — Critical (CVSS 10.0): Microsoft Defender for IoT Remote Code Execution Vulnerability
CVE-2021-42311 — Critical (CVSS 10.0): Microsoft Defender for IoT Remote Code Execution Vulnerability
CVE-2024-38089 — Critical (CVSS 9.1): Microsoft Defender for IoT Elevation of Privilege Vulnerability
CVE-2021-43882 — Critical (CVSS 9.0): Microsoft Defender for IoT Remote Code Execution Vulnerability
CVE-2024-29053 — High (CVSS 8.8): Microsoft Defender for IoT Remote Code Execution Vulnerability
CVE-2024-21323 — High (CVSS 8.8): Microsoft Defender for IoT Remote Code Execution Vulnerability

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