A vulnerability in a March 2021 Coldcard firmware allowed attackers to drain about 1,367 bitcoin (nearly $89 million) from 4,585 wallets in three waves. The attacker exploited weak key generation, targeting smaller balances in the latest wave with more complex transaction methods to evade detection. Galaxy Research suspects a single operator behind each wave but cannot confirm if all waves are linked. The attack continues, though the most valuable keys appear mostly depleted, highlighting risks in hardware wallet security and the importance of firmware updates.
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A third wave of attacks on Coldcard Bitcoin wallets has stolen an additional 208 BTC, raising total losses to 1,367 BTC (about $89 million). The attacks exploit a 2021 firmware flaw that used a predictable random number generator, allowing attackers ...
