Cronos halted its blockchain after an attacker exploited Tectonic, its largest lending protocol, in an incident estimated to have affected about $75 million in assets.

The attack reportedly involved manipulating the price of Tectonic’s thinly traded TONIC token nearly 100-fold in about 20 minutes, allowing the attacker to use the inflated tokens as collateral to borrow more liquid assets.

Tectonic held about $121.7 million in total value locked before the attack, with roughly $82.7 million in active loans. Its TVL subsequently plunged to about $3 million.

Cronos validators moved quickly to halt block production leaving most of the exploit-linked funds stranded on the network. Only about $6 million was reportedly moved to Ethereum before the shutdown.

The incident highlights a recurring DeFi vulnerability:

Thinly traded tokens can become dangerous collateral when lending protocols rely on market prices that can be manipulated.

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Tectonic has not confirmed the final losses or cause of the exploit while Cronos has not announced when the network will resume operations. Crypto.com said its centralized exchange and app were unaffected.

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