How severe is CVE-2021-41365?

CVE-2021-41365 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-41365 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-41365?

CVE-2021-41365 affects Microsoft Defender For Iot. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-41365?

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-2021-41365 published?

CVE-2021-41365 was published on 2021-12-15 and last updated on 2026-06-17.

CVE-2021-41365

CVE-2021-41365 is a high-severity vulnerability in Microsoft Defender For Iot with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-89.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.5
EPSS exploit prediction: 3% (84th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-89
Affected product: Microsoft Defender For Iot
Published: 2021-12-15
Last modified: 2026-06-17

Description

Microsoft Defender for IoT Remote Code Execution Vulnerability

Frequently asked questions

What is CVE-2021-41365?: Microsoft Defender for IoT Remote Code Execution Vulnerability
How severe is CVE-2021-41365?: CVE-2021-41365 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-41365 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-41365?: CVE-2021-41365 affects Microsoft Defender For Iot. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-41365?: 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-2021-41365 published?: CVE-2021-41365 was published on 2021-12-15 and last updated on 2026-06-17.

References

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
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CVE-2021-43882 — Critical (CVSS 9.0): Microsoft Defender for IoT Remote Code Execution Vulnerability
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