What’s Vulnerable › Vulnerabilities

CVE-2023-27892

• Severity: medium (CVSS 5.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-05-02 · updated 2026-06-17
• Weakness: CWE-125

Description

Insufficient length checks in the ShapeShift KeepKey hardware wallet firmware before 7.7.0 allow a global buffer overflow via crafted messages. Flaws in cf_confirmExecTx() in ethereum_contracts.c can be used to reveal arbitrary microcontroller memory on the device screen or crash the device. With physical access to a PIN-unlocked device, attackers can extract the BIP39 mnemonic secret from the hardware wallet.

Affected products

• Shapeshift Keepkey Firmware: from 7.5.2 before 7.7.0 — fixed in 7.7.0

How to fix

Upgrade to a fixed version: Shapeshift Keepkey Firmware 7.7.0. Check the vendor advisory for mitigations.

References

• https://blog.inhq.net/posts/keepkey-CVE-2023-27892/
• https://github.com/keepkey/keepkey-firmware/pull/337
• https://blog.inhq.net/posts/keepkey-CVE-2023-27892/
• https://github.com/keepkey/keepkey-firmware/pull/337

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