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Cronos Halts Network After $75M Tectonic Lending Exploit

Cronos validators hit the kill switch on their blockchain after an attacker manipulated an illiquid token to drain $75 million from Tectonic.

Sofia Marek

· 2 min read

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Cronos Halts Network After $75M Tectonic Lending Exploit
Image via CoinDesk

Key takeaways

  • Cronos validators halted the network to stop a $75 million exploit on lending app Tectonic.
  • The attacker pumped the low-volume TONIC token 100-fold to borrow valuable crypto assets.
  • A rapid chain pause trapped most of the stolen funds on the blockchain.

Cronos validators slammed the emergency brakes on their entire blockchain after an attacker yanked $75 million out of lending protocol Tectonic.

It wasn't some high-tech hack—just plain old market manipulation. The attacker artificially jacked up Tectonic's native token, TONIC, by 100 times its value. Because TONIC had paper-thin liquidity, moving the price took minimal effort. Once the token's paper value soared, the hacker posted it as collateral on Tectonic to borrow real crypto assets.

Trapped on-chain

They didn't get to finish the getaway. Before the thief could move all those borrowed assets off the network, Cronos validators stepped in and killed block production cold. That rapid shutdown left most of the funds stranded right on the frozen chain. Busted.

Why it matters

Using illiquid tokens as lending collateral is still a massive vulnerability in DeFi. If an asset lacks trading depth, bad actors don't need a smart contract bug to drain a pool—they just need enough cash to push the oracle price up. Pulling the emergency plug saved millions this time, but it lays bare an uncomfortable truth: a handful of validators can freeze a major blockchain whenever crisis hits.

Source: CoinDesk

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Sofia Marek

Sofia reviews exchanges and crypto casinos, focused on fees, safety and what actually reaches the player.

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