How severe is CVE-2021-42300?

CVE-2021-42300 has a CVSS 3.x base score of 6.0, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2021-42300 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-2021-42300?

CVE-2021-42300 affects Microsoft Azure Sphere. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-42300?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-42300 published?

CVE-2021-42300 was published on 2021-11-10 and last updated on 2026-06-17.

CVE-2021-42300

CVE-2021-42300 is a medium-severity vulnerability in Microsoft Azure Sphere with a CVSS 3.x base score of 6.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 6.0)
CVSS v2: 4.6
EPSS exploit prediction: 1% (42nd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Azure Sphere
Published: 2021-11-10
Last modified: 2026-06-17

Description

Azure Sphere Tampering Vulnerability

Frequently asked questions

What is CVE-2021-42300?: Azure Sphere Tampering Vulnerability
How severe is CVE-2021-42300?: CVE-2021-42300 has a CVSS 3.x base score of 6.0, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2021-42300 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-2021-42300?: CVE-2021-42300 affects Microsoft Azure Sphere. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-42300?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-42300 published?: CVE-2021-42300 was published on 2021-11-10 and last updated on 2026-06-17.

References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42300

Affected products (1)

cpe:2.3:a:microsoft:azure_sphere:*:*:*:*:*:*:*:*

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