Hack history / 2020 / Hack or exploit

SYFI

Hack or exploit on Sep 10, 2020 · Arithmetic Error

SOURCES AGREE ON DATE AND LOSS · 2 SOURCES

Lost

$250K

dollars at the time

Returned

none listed

as the sources state it

Rank

#1,402

among thefts by dollars lost

What happened

An anonymous trader exploited a rebase bug in SYFI's unaudited contract code. By staking a small amount and leveraging the arithmetic error in the rebase logic, they extracted nearly $250K in realized gains while crashing the token price from $174 to $0.0004.

Details

Date: Sep 10, 2020
Kind: Hack or exploit
Method: Arithmetic Error
How in: Smart contract bug
Target: DeFi protocol
Chains: Ethereum

Reported by

DefiLlama ↗
SlowMist Hacked ↗

Related incidents

Cover Protocol 2020 · Hack or exploit · $9.4M

Cite this page

SwanBluechip, "SYFI hack, Sep 10, 2020: $250K lost", Crypto hack history, https://swan-hack-tracker.pages.dev/history/i/ht4b2f44e1f8/ (data as of 2026-10-31).

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