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TI-2021-08247 Aliases CVE-2021-26430GHSA-c556-742c-cv9q

Azure Sphere Denial of Service Vulnerability

Priority LOW 28Published · Updated

Key facts

Attack vector
Local
Privileges required
High
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from Microsoft.

Summary

Azure Sphere Denial of Service Vulnerability

Why it matters now

EPSS 0.00732 54th percentileScored 2026-11-07
Fix Fixed Azure Sphere (Microsoft): 21.07

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
MicrosoftAzure Sphere20.00 to before 21.0721.07Patch availableCNA
  • Azure Sphere VendorMicrosoft Affected 20.00 to before 21.07 Fixed in 21.07 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:microsoft:azure_sphere:*:*:*:*:*:*:*:*before 21.07VulnerableMicrosoft
  • cpe:2.3:a:microsoft:azure_sphere:*:*:*:*:*:*:*:* Versions before 21.07 Vulnerable ·Microsoft

Remediation

  • Fix · CNA Azure Sphere (Microsoft) Fixed in 21.07

Vendor assessments

Microsoft

Microsoft's page for this CVE →

Impact
Denial of Service
Exploited
No
Publicly disclosed
No
Exploitability
Exploitation Less Likely
ProductStatusPlan or fix
Azure SphereFixed 21.07 · Security Update

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-26430
  2. 2026-10-03 Alias added: GHSA-c556-742c-cv9q

References

Patch 2

  • TI-2021-08650 Azure Sphere Unsigned Code Execution Vulnerability CVSS 3.1CRITICAL 9.3
  • TI-2020-18104 A code execution vulnerability exists in the normal world’s signed code execution… CVSS 3.1HIGH 7.8
  • TI-2020-12956 Azure Sphere Unsigned Code Execution Vulnerability CVSS 3.1HIGH 8.8
  • TI-2020-12978 Azure Sphere Elevation of Privilege Vulnerability CVSS 3.1HIGH 8.2
  • TI-2020-12980 Azure Sphere Unsigned Code Execution Vulnerability CVSS 3.1HIGH 7.3
  • TI-2020-12973 Azure Sphere Unsigned Code Execution Vulnerability CVSS 3.1HIGH 7.8
See all 28 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences