Hack history / 2021 / Hack or exploit
Definer
Hack or exploit on Dec 13, 2021 · Oracle Attack
ONE SOURCE · 1 SOURCE
Lost
undisclosed
dollars at the time
Returned
none listed
as the sources state it
Rank
not ranked
collapses, frauds and later news are not ranked
What happened
On December 13, the DeFi platform Definer oracle was attacked. This incident was caused by the problem of Definer’s implementation of the oracle in OEC. It used the token balance of a single liquidity pool at a point in time as the price source, which led to the accident. The implementation of Ethereum used ChainLink’s The oracle does not have this problem.
Details
- Date
- Dec 13, 2021
- Kind
- Hack or exploit
- Method
- Oracle Attack
- How in
- Price, oracle and governance
- Target
- not stated
- Chains
- Ethereum
Reported by
Related incidents
Cite this page
SwanBluechip, "Definer hack, Dec 13, 2021: undisclosed lost", Crypto hack history, https://swan-hack-tracker.pages.dev/history/i/ht0a7d36bb01/ (data as of 2026-10-31).