Cysic Halts Cross-Chain Bridge After Unauthorized 10 Million Token Mint
Blockchain network project Cysic suspended its cross-chain bridge after an attacker exploited a bridge processing flaw to mint 10 million unauthorized CYS tokens on BNB Smart Chain on Saturday. The unauthorized issuance occurred around 12:31 UTC, prompting team members to blacklist the recipient wallet about an hour and fifteen minutes later. The blacklist froze approximately 2.8 million CYS that remained at the address.
The security breach was restricted to bridge messaging and token minting systems, leaving the underlying mainnet and existing wallet balances unaffected. No funds or assets held in user wallets were stolen or transferred. CYS tokens serve to coordinate network incentives for compute providers, governance participants, and contributors.
Project developers emphasized that the 10 million token figure does not represent the final financial impact of the event. Ongoing reviews are examining token transfers and swaps to calculate actual losses. Cysic has retained a third-party security firm to assist with the investigation and intends to publish a detailed follow-up report once the current inquiry phase concludes.
Key points
- An attacker exploited a processing flaw to mint 10 million unauthorized CYS tokens on BNB Smart Chain.
- Cysic suspended its cross-chain bridge and blacklisted the recipient address, freezing 2.8 million tokens.
- Mainnet operations and user wallet balances were unaffected, with no existing user assets stolen.
- Financial losses remain under review while Cysic works with a security firm to investigate the incident.
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How we writeDisclaimerQuestions and answers
Why was the Cysic bridge halted?
The bridge was suspended after an attacker exploited a message processing flaw to mint 10 million unauthorized CYS tokens on BNB Smart Chain.
Were user funds stolen in the Cysic exploit?
No existing user funds or wallet balances were stolen or transferred. The exploit was strictly limited to bridge message processing and token minting.
How many CYS tokens were frozen after the incident?
Cysic blacklisted the recipient address roughly an hour after the unauthorized mint, restricting transfers for approximately 2.8 million CYS that remained in the wallet.