Critical Vulnerability Discovered in Bitcoin Hardware Wallets Using ESP32 Chip

A critical vulnerability has been found in certain less expensive Bitcoin hardware wallets using the ESP32 chip. This flaw, identified as CVE-2025-27840, impacts the chip’s random number generator, leading to a compromised ability to create secure private keys. This increased vulnerability poses risks of malicious firmware updates or brute-force key-pair attacks, potentially enabling illegal Bitcoin transactions.