Fei/Rari Fuse
A $80M loss on Ethereum in 2022, caused by a reentrancy flaw. Here's what happened, the vulnerability class behind it, and where it stands in ProveWall's re-proof pipeline.
$80Mreported loss
2022year
Ethereumchain
Reentrancyvulnerability class
✔ Re-proven on a forked chain
We re-executed this exploit against the incident state on a forked chain and it moved value — the vulnerability reproduces. We have not separately re-tested the project's post-mortem patch against it, so this page claims the reproduction only.What this class of bug is
Reentrancy lets a malicious callback re-enter a function before its state is settled, enabling repeated withdrawals or double-spends against the same balance.
How to read this page. The dollar figure is the publicly reported loss attributed to this
incident. A ProveWall re-proof reproduces the vulnerability class/mechanism by execution on a forked chain,
with a signed receipt — we say so explicitly only once that execution has passed.
Other reentrancy exploits
Same vulnerability class, re-proven or queued on the wall: Cream Finance · Curve / Vyper reentrancy · The DAO · Grim Finance
Want your own contract actually proven — not guessed?
Static tools and LLM auditors ask "is there a check here?" and miss the check that exists but is wrong. OmniGuard Labs runs the exploit on a forked chain and sends you a signed pass/fail receipt. Request a proof-backed audit →