CVE-2021-31616: Insufficient length checks in the ShapeShift KeepKey hardware wallet firmware before 7.1.0 allow a stack buffe

Q: How do I fix CVE-2021-31616?

keepkey firmware: upgrade to 7.1.0. Exact commands for each OS are on this page.

Q: Is CVE-2021-31616 being exploited?

CVE-2021-31616 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-31616 affect?

CVE-2021-31616 affects keepkey firmware. Severity is high (CVSS 8.8). 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 protection

Q: How urgent is CVE-2021-31616?

Priority 57/100. High severity; Public exploit reference

This month

HIGH 8.8UPGRADE

CVE-2021-31616 is a high-severity flaw (CVSS 8.8) affecting keepkey firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	2.5% (top 15%)
CISA exploited list	No
Weakness	CWE-787
Published	2021-05-06
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: shapeshift

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-05-06 13:15 UTCPublished CVE record published
2026-06-17 03:52 UTCUpdated Record last modified

shapeshift keepkey firmware UPGRADE

Affected: >= 7.0.3 and < 7.1.0

Fixed in: 7.1.0

Safe to downgrade to: a release before 7.0.3

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-31616?

keepkey firmware: upgrade to 7.1.0. Exact commands for each OS are on this page.

Is CVE-2021-31616 being exploited?

CVE-2021-31616 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-31616 affect?

CVE-2021-31616 affects keepkey firmware. Severity is high (CVSS 8.8). 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 protection

How urgent is CVE-2021-31616?

Priority 57/100. High severity; Public exploit reference

Related CVEs

CVE-2023-27892 LOW 3.8 UPGRADE Insufficient length checks in the ShapeShift KeepKey hardware wallet firmware before 7.7.0 allow a global buff
CVE-2022-30330 MEDIUM 6.6 UPGRADE In the KeepKey firmware before 7.3.2,Flaws in the supervisor interface can be exploited to bypass important se

References

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