Hack history / 2021 / Hack or exploit
Grim Finance
Hack or exploit on Dec 18, 2021 · Reentrancy
ATTACK TX CONFIRMED ON CHAINSOURCES AGREE ON DATE AND LOSS · 5 SOURCES
Lost
$30M
dollars at the time
Returned
none listed
as the sources state it
Rank
#157
among thefts by dollars lost
What happened
Grim Finance's GrimBoostVault lacked reentrancy guards. Attackers exploited this via nested calls during safeTransferFrom to accumulate false collateral through repeated deposits.
Details
- Date
- Dec 18, 2021
- Kind
- Hack or exploit
- Method
- Reentrancy
- How in
- Smart contract bug
- Target
- DeFi protocol
- Chains
- Fantom
- Audit (rekt.news)
- Solidity Finance
Related incidents
CREAM Lending 2021 · Hack or exploit · $18.8M
flash.sx / vaults.sx 2021 · Hack or exploit · $13M
Gamma 2021 · Hack or exploit · $8.2M
BurgerSwap 2021 · Hack or exploit · $7.2M
SurgeBNB 2021 · Hack or exploit · $5M
flash.sx / vaults.sx 2021 · Hack or exploit · $13M
Gamma 2021 · Hack or exploit · $8.2M
BurgerSwap 2021 · Hack or exploit · $7.2M
SurgeBNB 2021 · Hack or exploit · $5M
Cite this page
SwanBluechip, "Grim Finance hack, Dec 18, 2021: $30M lost", Crypto hack history, https://swan-hack-tracker.pages.dev/history/i/ht29b664cb0c/ (data as of 2026-10-31).