Bridge Exploit attacks in 2021

$13M+ drained from THORChain across two attacks one week apart, both exploiting fake-deposit flaws in the Bifrost Ethereum bridge weeks into Chaosnet.

Vulnerability in ChainSwap's Ethereum-BSC bridge let an attacker mint arbitrary amounts of 20+ supported tokens; $4M drained, affected tokens crashed 95%+.

Attacker detected a repeated k-value in two BSC signatures, back-calculated Anyswap V3's MPC private key, and drained $7.9M from its cross-chain router pools.