What is CVE-2021-42300?

CVE-2021-42300 is a medium-severity vulnerability in Microsoft Azure Sphere. CVSS score: 6.0/10. Published 2021-11-10.

How severe is CVE-2021-42300?

Medium severity. CVSS v3 base score is 6.0 out of 10.

Vulnerability in Microsoft Azure Sphere

CVE-2021-42300

Azure Sphere Tampering Vulnerability

Published 2021-11-10 · last modified 2026-08-19.

CVSS v3 metric

CVSS v3 base score 6.0 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.006 (47.7th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.7% 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-2021-42300 (vendor-advisory, patch)

Frequently asked questions

What is CVE-2021-42300?: CVE-2021-42300 is a medium-severity vulnerability in Microsoft Azure Sphere. CVSS score: 6.0/10. Published 2021-11-10.
How severe is CVE-2021-42300?: Medium severity. CVSS v3 base score is 6.0 out of 10.