CVE-2021-31616

Name: CVE-2021-31616
Creator: NVD / NIST
Published: 2021-05-06T13:15:12.693+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 2.50%

Last modified Jun 17, 2026

CVE-2021-31616 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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. EPSS estimates a 2.50% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS Probability

2.50%

82.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Shapeshift	Keepkey Firmware	>= 7.0.3, < 7.1.0

References

https://blog.inhq.net/posts/keepkey-CVE-2021-31616/Exploit, Patch, Third Party Advisory
https://github.com/keepkey/keepkey-firmware/commit/e49d45594002d4d3fbc1f03488e6dfc0a0a65836Patch, Third Party Advisory
https://github.com/keepkey/keepkey-firmware/releases/tag/v7.1.0Release Notes, Third Party Advisory
https://shapeshift.com/library/keepkey-important-update-issued-april-4-requiredVendor Advisory
https://blog.inhq.net/posts/keepkey-CVE-2021-31616/Exploit, Patch, Third Party Advisory
https://github.com/keepkey/keepkey-firmware/commit/e49d45594002d4d3fbc1f03488e6dfc0a0a65836Patch, Third Party Advisory
https://github.com/keepkey/keepkey-firmware/releases/tag/v7.1.0Release Notes, Third Party Advisory
https://shapeshift.com/library/keepkey-important-update-issued-april-4-requiredVendor Advisory

Timeline

Published: May 6, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-31616?

How severe is CVE-2021-31616?

CVE-2021-31616 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 2.50% probability of exploitation in the next 30 days.

How do I fix CVE-2021-31616?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-31616?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST