STM32

Trezor Warns of Email Provider Breach Used in Targeted Phishing Campaign Against Hardware Wallet Users

Trezor has disclosed that attackers compromised an external email provider and leveraged it to send phishing messages that appeared to originate from the company. The emails carried the subject line 'Critical Security Alert: STM32 Entropy Vulnerability' and falsely claimed a hardware flaw in STM32 microcontrollers that would reduce entropy and allow seed phrase reconstruction. No such CVE exists, and the campaign followed classic social-engineering patterns of urgency and brand impersonation aimed at stealing recovery phrases. Trezor has since disabled the malicious domain and continues investigating how the provider was accessed. Similar messages may have reached users of BitBox, suggesting possible compromise of shared service providers across the hardware wallet ecosystem. The incident underscores the difficulty of detecting phishing when it originates from legitimate third-party infrastructure.

Coldcard Firmware Flaw Linked to Theft of 1,082 Bitcoin in 41 Minutes

A critical defect in COLDCARD firmware degraded entropy during BIP39 seed generation, enabling offline enumeration of weak seeds and resulting in the theft of 1,082.65 BTC from 1,196 addresses in just 41 minutes on July 30, 2026. The root cause traces to a March 2021 integration error that replaced the STM32 hardware RNG with a deterministic software PRNG initialized only by chip ID and timing registers, yielding roughly 40 bits of effective entropy on Mk3 devices and 72 bits on Mk4, Mk5, and Q models. Coinkite issued emergency firmware updates, yet any seed created on vulnerable versions remains exposed regardless of later updates. Additional sweeps matching the same pattern have raised total observed losses to 1,367.05 BTC across 4,585 addresses. Users must generate fresh seeds on patched firmware and migrate funds immediately; dice-based entropy addition or BIP39 passphrases provide only partial mitigation.