How severe is CVE-2021-26428?

CVE-2021-26428 has a CVSS 3.x base score of 4.4, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-26428 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-26428?

CVE-2021-26428 affects Microsoft Azure Sphere. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-26428?

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

When was CVE-2021-26428 published?

CVE-2021-26428 was published on 2021-08-12 and last updated on 2026-06-17.

CVE-2021-26428

CVE-2021-26428 is a medium-severity vulnerability in Microsoft Azure Sphere with a CVSS 3.x base score of 4.4. 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 4.4)
CVSS v2: 2.1
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Azure Sphere
Published: 2021-08-12
Last modified: 2026-06-17

Description

Azure Sphere Information Disclosure Vulnerability

Frequently asked questions

What is CVE-2021-26428?: Azure Sphere Information Disclosure Vulnerability
How severe is CVE-2021-26428?: CVE-2021-26428 has a CVSS 3.x base score of 4.4, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-26428 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-26428?: CVE-2021-26428 affects Microsoft Azure Sphere. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-26428?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-26428 published?: CVE-2021-26428 was published on 2021-08-12 and last updated on 2026-06-17.

References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26428

Affected products (1)

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

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