Beginning June 22, 2021, Haven Protocol was exploited through multiple vulnerabilities including miner reward validation bypass, xJPY to xBTC conversion exploitation, and hidden burn/mint amount bugs. An unknown quantity of XHV tokens were minted before the network rolled back to pre-attack state on July 20 via hard fork.

Based on Monero’s privacy-centric DeFi protocol Haven Protocol (XHV), it released analysis reports and measures for three serious attacks related to it in late June. The chain rollback plan will be initiated and a hard fork will be implemented. Fix the known vulnerabilities in protocol minting. Regarding specific attacks, on June 24, 203,000 xUSD and 13.5 xBTC were minted in two attacks; on June 27, an unknown amount of XHV was minted due to a vulnerability in the conversion verification of xAsset; June 29 , The attacker exploited a vulnerability that allowed the minting of 9 million xUSD.