Hack history / 2021 / Hack or exploit
Formation.Fi
Hack or exploit on Nov 21, 2021 · Flash Loan Attack
ONE SOURCE · 1 SOURCE
Lost
$100K
dollars at the time
Returned
none listed
as the sources state it
Rank
#1,729
among thefts by dollars lost
What happened
DeFi protocol Formation.Fi was attacked by flash loans. The main reason for this incident is that the project party underestimated the impact of fee on totalTokens when designing the function swapIn, and ignored the impact of decimal point accuracy between different tokens.
Details
- Date
- Nov 21, 2021
- Kind
- Hack or exploit
- Method
- Flash Loan Attack
- How in
- Price, oracle and governance
- Target
- not stated
- Chains
- Ethereum
Reported by
Cite this page
SwanBluechip, "Formation.Fi hack, Nov 21, 2021: $100K lost", Crypto hack history, https://swan-hack-tracker.pages.dev/history/i/htbe52ad50a4/ (data as of 2026-10-31).