Euler attack causes locked tokens, losses in 11 DeFi protocols, including Balancer

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Contagion from the Dec. 12 flash loan attack against Euler has spread far and wide, resulting in frozen or lost funds for 11 different decentralized finance (DeFi) protocols, according to Dec. 13 reports from each of them on Twitter. Balancer, an Ethereum protocol with over $1 billion total value locked (TVL), is among the affected protocols. Below is a rundown of the major exploits and what we know so far.


Balancer reported on March 13 that the Euler Boosted USD (bb-e-USD) pool had been affected by the exploit. Approximately $11.9 million worth of tokens from this pool were sent to Euler during the exploit. The balancer emergency subDAO reacted by pausing the pool and putting it into recovery mode. However, over 65% of the pool’s TVL had already been lost by the time it was paused.

As a result of a bug in the app’s user interface (UI), liquidity providers cannot retrieve the remaining funds left in the pool. However, a new UI will be offered “in the near future” that will allow the remaining funds to be withdrawn, Balancer said. No other pools have been affected, Balancer clarified.

Angle Protocol

Angle Protocol released a preliminary report on its exposure to the attack. It may have lost over $17 million worth of USD Coin (USDC). This may have caused the agEUR stablecoin, which is pegged to the euro, to become undercollateralized. The team is still investigating and attempting to prepare a detailed balance sheet. All minting and redemption of agEUR is currently paused, but borrowers can still repay their debts to the protocol as normal, the team said.

Idle Finance

Idle Finance has provided a detailed list of its losses due to the Euler exploit. It seems to have lost around $5.9 million worth of tokens in total, based on March 13 Ether (ETH) and euro prices. The team has paused all Best Yield vaults and Yield Tranches related to Euler to prevent further losses.

Yearn Finance

Yearn Finance has over $423 million in TVL, according to DeFi Llama. It reported indirect exposure to Euler, through Angle Protocol and Idle Finance. It has lost approximately $1.38 million. However, the team said that any bad debt not covered by Idle and Angle would be covered by the Yearn Treasury.

Yield Protocol

Yield Protocol is another protocol affected by the exploit. Its “mainnet liquidity pools are built on Euler,” according to the team’s announcement regarding the attack. The company has disabled the mainnet app, paused borrowing, and is investigating the attack. Its mainnet liquidity pools appear to have been affected, with a possible loss of “less than $1.5 million.”


InverseFinance reported that it was hit as well. It’s DOLA Fed for the DOLA-bb-e-USD on Balancer lost over $860,000. The team said it is communicating with Balancer in an attempt to get these funds returned to depositors.

Related: Euler Finance hacked for over $195M in a flash loan attack


SwissBorg reported that “a small portion of [its] Smart Yield Program was impacted” by the exploit. However, “the extent of the damage is minimal thanks to our Risk Management Procedure.” The team said that it would compensate all losses from its funds, and its users “will not suffer any loss from this event.”

In a Telegram conversation with Cointelegraph, SwissBorg founder Cyrus Fazel clarified that the protocol ranks yield strategies based on risk, time, and APY. Since Euler was rated Risk 2- Adventurous, SwissBorg users “had a limited amount” invested in Euler. This mitigated against losses to the protocol, he explained.

Other affected protocols

Opyn, Mean, Sense and Harvest also reported they might have been affected by the exploit, though none have provided details on how much has been lost. This brings the total number of affected protocols to 11, with $37.6 million in cumulative losses. 

Euler Finance is a crypto borrowing and lending protocol that runs on Ethereum. It became popular thanks in part to its support for using liquid staking derivatives (LSDs) such as Coinbase Staked ETH (cbETH) or Lido Staked ETH (stETH) as collateral for loans. On March 8, Euler had over $311 million in crypto locked inside its smart contracts. Since the exploit, its TVL has fallen to $10.37 million.

This article is strictly for informational purposes only. It is not a direct offer or solicitation of an offer to buy or sell, or a recommendation or endorsement of any products, services, or companies. does not provide investment, tax, legal, business or accounting advice. Neither the company nor the author is responsible, directly or indirectly, for any loss or damage caused or alleged to be caused by, or in connection with, the use of or reliance on any content, goods, services or opinions mentioned in this article.

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