Three days after Aztec Labs' deprecated Aztec Connect blockchain <button class="define-target" id="bridge">bridge</button> was <a href="https://www.web3isgoinggreat.com/?id=aztec-connect-exploit" target="_blank">exploited</a> for $2.1&nbsp;million, the project has been hacked again for the same amount. Aztec Labs confirmed the second exploit, again trying to emphasize that the code was deprecated four years ago.<p>The hacks are part of a <a href="https://www.web3isgoinggreat.com/?collection=legacy-exploit" target="_blank">spate of exploits</a> targeting legacy smart contracts belonging to projects including <a href="https://www.web3isgoinggreat.com/?id=raydium-legacy-smart-contract-exploit" target="_blank">Raydium</a> and <a href="https://www.web3isgoinggreat.com/?id=dxsale-exploit" target="_blank">DxSale</a>. Although some projects have developed techniques to circumvent the immutable nature of blockchains and allow smart contracts to be upgraded or retired, many legacy contracts cannot be changed or shut down, leaving them vulnerable to attack indefinitely.</p>

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