How severe is CVE-2021-26430?

CVE-2021-26430 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 none, and availability high.

Is CVE-2021-26430 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-26430?

CVE-2021-26430 affects Microsoft Azure Sphere. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-26430?

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

When was CVE-2021-26430 published?

CVE-2021-26430 was published on 2021-08-12 and last updated on 2026-06-17.

CVE-2021-26430

CVE-2021-26430 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: 2.1
EPSS exploit prediction: 1% (46th 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 Denial of Service Vulnerability

Frequently asked questions

What is CVE-2021-26430?: Azure Sphere Denial of Service Vulnerability
How severe is CVE-2021-26430?: CVE-2021-26430 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 none, and availability high.
Is CVE-2021-26430 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-26430?: CVE-2021-26430 affects Microsoft Azure Sphere. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-26430?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-26430 published?: CVE-2021-26430 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-2021-26430

Affected products (1)

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

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