CVE-2021-31616

Insufficient length checks in the ShapeShift KeepKey hardware wallet firmware before 7.1.0 allow...

8.8 High

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

2.50%Up 0.6 points since May 7, 2021

What each source reports

NVD Score used 8.8

Record: CVE-2021-31616
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS 2.0: 6.8 MediumAV:N/AC:M/Au:N/C:P/I:P/A:P
Weakness: CWE-787
Updated: 2026-11-02

CVE List No score

Record: CVE-2021-31616
Updated: 2026-11-02

EUVDEUVD-2021-18505 No score

Record: EUVD-2021-18505
Updated: 2026-11-03

GitHub AdvisoriesGHSA-jjq4-78fg-7j7h 8.8

Insufficient length checks in the ShapeShift KeepKey hardware wallet firmware before 7.1.0 allow...

Record: GHSA-jjq4-78fg-7j7h
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-120, CWE-787
Updated: 2026-11-02

Affected products

shapeshift keepkey firmware

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-31616 is a high vulnerability (CVSS 8.8) in Shapeshift Keepkey Firmware, published May 6, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.50%, the 84th percentile. No source names a fixed version.