CVE-2023-27892: Shapeshift Keepkey Firmware

Medium severity, CVSS 5.7. EPSS: 0.5% chance of exploitation in the next 30 days.

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)

Published 2023-05-02. Last modified 2026-06-17.