Ethereum · The Block
Cysic stops bridge after attacker mints tokens and moves $727,000 to Ethereum
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An attacker minted 10 million CYS tokens on BNB Chain by exploiting Cysic's cross-chain bridge on Saturday, the project confirmed.
Key facts
- Including the SWFT transfer, the address received about 306.6 ETH, worth roughly $727,000 at Sunday's ETH price of about $2,372
- ET, it sold 5.65 million CYS in 11 transactions for a combined 588,315 USDT, or about 10 cents per token
- After the second round of sales, the address bridged its BNB as well, sending 80 BNB through Mayan at 9:05 a.m
- On Ethereum, the address received seven payouts from Mayan totaling about 224.66 ETH and a 41.05 ETH payout from deBridge, with the last arriving at 9:06 a.m
Summary
Cysic, founded in 2022, builds specialized hardware and runs a Layer 1 network for generating zero-knowledge proofs. The Cysic Foundation said in an incident report posted to X on Sunday that the attacker "gained unauthorized access to a database used by services supporting the bridge and exploited a vulnerability in the relevant processing logic to submit a fraudulent mint message. The foundation said the incident was confined to the bridge's message-processing and minting functions and did not affect the Cysic mainnet. The attacker's unauthorized mint took place at 8:31 a.m.