What is CVE-2021-26429?

CVE-2021-26429 is a high-severity vulnerability in Microsoft Azure Sphere. CVSS score: 7.7/10. Published 2021-08-12.

How severe is CVE-2021-26429?

High severity. CVSS v3 base score is 7.7 out of 10.

Vulnerability in Microsoft Azure Sphere

CVE-2021-26429

Azure Sphere Elevation of Privilege Vulnerability

Published 2021-08-12 · last modified 2026-08-10.

CVSS v3 metric

CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L.

EPSS exploit prediction

EPSS: 0.006 (46.4th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 46.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Microsoft Azure Sphere — versions 20.00
Microsoft Azure Sphere

References

af854a3a-2127-422b-91ae-364da2661108 (Patch, Vendor Advisory)
msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26429 (vendor-advisory, patch)

Frequently asked questions

What is CVE-2021-26429?: CVE-2021-26429 is a high-severity vulnerability in Microsoft Azure Sphere. CVSS score: 7.7/10. Published 2021-08-12.
How severe is CVE-2021-26429?: High severity. CVSS v3 base score is 7.7 out of 10.