How severe is CVE-2021-31616?

CVE-2021-31616 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-31616 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-31616?

CVE-2021-31616 affects Shapeshift Keepkey Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-31616?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-31616 published?

CVE-2021-31616 was published on 2021-05-06 and last updated on 2026-06-17.

CVE-2021-31616

CVE-2021-31616 is a high-severity vulnerability in Shapeshift Keepkey Firmware with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.8
EPSS exploit prediction: 2% (83rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Shapeshift Keepkey Firmware
Published: 2021-05-06
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-31616?: 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.
How severe is CVE-2021-31616?: CVE-2021-31616 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-31616 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-31616?: CVE-2021-31616 affects Shapeshift Keepkey Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-31616?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-31616 published?: CVE-2021-31616 was published on 2021-05-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:shapeshift:keepkey_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Shapeshift Keepkey Firmware

CVE-2019-18672 — High (CVSS 7.5): Insufficient checks in the finite state machine of the ShapeShift KeepKey hardware wallet before firmware 6.2.2 allow a…
CVE-2018-6875 — High (CVSS 7.5): Format String vulnerability in KeepKey version 4.0.0 allows attackers to trigger information display (of information…
CVE-2023-27892 — Low (CVSS 3.8): Insufficient length checks in the ShapeShift KeepKey hardware wallet firmware before 7.7.0 allow a global buffer…
CVE-2019-14355 — Low (CVSS 2.4): On ShapeShift KeepKey devices, a side channel for the row-based OLED display was found. The power consumption of each…

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