How severe is CVE-2021-43888?

CVE-2021-43888 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-43888 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-43888?

CVE-2021-43888 affects Microsoft Defender For Iot. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-43888?

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-2021-43888 published?

CVE-2021-43888 was published on 2021-12-15 and last updated on 2026-06-17.

CVE-2021-43888

CVE-2021-43888 is a high-severity vulnerability in Microsoft Defender For Iot with a CVSS 3.x base score of 7.5. 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 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 3% (86th 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 Information Disclosure Vulnerability

Frequently asked questions

What is CVE-2021-43888?: Microsoft Defender for IoT Information Disclosure Vulnerability
How severe is CVE-2021-43888?: CVE-2021-43888 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-43888 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-43888?: CVE-2021-43888 affects Microsoft Defender For Iot. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-43888?: 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-2021-43888 published?: CVE-2021-43888 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-2021-43888

Affected products (1)

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

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