CVE-2021-31616

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-05-06 · updated 2026-06-17
Weakness: CWE-787

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.

Affected products

Shapeshift Keepkey Firmware: from 7.0.3 before 7.1.0 — fixed in 7.1.0

How to fix

Upgrade to a fixed version: Shapeshift Keepkey Firmware 7.1.0. Check the vendor advisory for mitigations.

References

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

Get alerted when CVE-2021-31616 or the next vulnerability affects your stack