Hack history / 2021 / Hack or exploit
Uranium Finance
Hack or exploit on Apr 28, 2021 · Arithmetic Error
ATTACK TX CONFIRMED ON CHAININ REVIEWSOURCES AGREE ON DATE AND LOSS · 5 SOURCES
Lost
$50M
sources: $50M to $57.2M
Returned
none listed
as the sources state it
Rank
#108
among thefts by dollars lost
What happened
Uranium Finance on BSC suffered a calculation error in its v2 pair swap function. The sanity check validation used an incorrect constant (1,000,000) that was 100x too large compared to actual balance adjustments (10,000), allowing attackers to send minimal value and extract maximum reserves through the swap function.
In review: possible duplicate within one source.
Details
- Date
- Apr 28, 2021
- Kind
- Hack or exploit
- Method
- Arithmetic Error
- How in
- Smart contract bug
- Target
- DeFi protocol
- Chains
- BNB Chain
- Audit (rekt.news)
- unaudited
After the theft
- Recovered or seized
- $31M
“authorities seized approximately $31 million in cryptocurrency linked to the 2021 Uranium Finance hack.” (SlowMist Hacked)
Related incidents
Compound V2 2021 · Hack or exploit · $147M
ValueDefi 2021 · Hack or exploit · $11M
Pizza DeFi 2021 · Hack or exploit · $5M
Gamma 2021 · Hack or exploit · $4.5M
Bogged Finance 2021 · Hack or exploit · $3M
ValueDefi 2021 · Hack or exploit · $11M
Pizza DeFi 2021 · Hack or exploit · $5M
Gamma 2021 · Hack or exploit · $4.5M
Bogged Finance 2021 · Hack or exploit · $3M
Cite this page
SwanBluechip, "Uranium Finance hack, Apr 28, 2021: $50M lost", Crypto hack history, https://swan-hack-tracker.pages.dev/history/i/ht9769b609c4/ (data as of 2026-10-31).