Aztec Suffers Second $2.1M Exploit in Under a Week
Aztec was hit by a second $2.1M exploit in less than a week, raising alarms about risks from deprecated smart contracts.
Aztec, a blockchain privacy protocol, suffered a second exploit worth approximately $2.1 million in less than a week, according to findings flagged by blockchain security firm SlowMist. The back-to-back attacks have drawn urgent attention from the broader crypto security community and raised serious questions about how projects manage legacy infrastructure after they stop actively developing it.
Security researchers are now sounding the alarm on a systemic vulnerability class: deprecated smart contracts. These are contracts that projects have officially abandoned or replaced but have left deployed on-chain — and, critically, still holding user funds or accessible liquidity. Unlike traditional software, smart contracts cannot simply be patched or taken offline without deliberate intervention, meaning old code can sit exposed indefinitely.
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The twin incidents at Aztec underscore how quickly threat actors can return to exploit the same protocol when the root vulnerability is not fully addressed after an initial attack. A second breach of the same scale within days suggests that either the initial remediation was incomplete or that attackers identified additional attack surfaces in related legacy contracts that were not prioritized in the first response.
The pattern mirrors a growing trend across decentralized finance, where deprecated or dormant contracts have become attractive targets precisely because development teams have often moved on and monitoring has lapsed. Security professionals argue that sunsetting a protocol must include either migrating all assets out of legacy contracts or implementing kill-switch mechanisms that can lock them against interaction.
The cumulative loss from both incidents now stands at a significant figure that illustrates the real-world financial stakes of smart contract lifecycle management — a discipline that remains underemphasized across the industry. Continue reading at Cointelegraph.
