Hack history / 2020 / Hack or exploit
Bancor V3
Hack or exploit on Jun 21, 2020 · Improper Access Control
ATTACK TX CONFIRMED ON CHAININ REVIEWSOURCES DISAGREE ON DATE OR LOSS · 3 SOURCES
Lost
$545K
sources: $135K to $545K
Returned
none listed
as the sources state it
Rank
#1,118
among thefts by dollars lost
What happened
Bancor Network v0.6 smart contract lacked authentication on the 'from' address parameter, allowing anyone to use stored token approvals to steal user funds. The Bancor team conducted a self-exploit withdrawing $409,656, but front-runners capitalized on the same vulnerability extracting an additional $135,229 before patch deployment.
In review: sources disagree on the loss.
Details
- Date
- Jun 21, 2020
- Kind
- Hack or exploit
- Method
- Improper Access Control
- How in
- Smart contract bug
- Target
- DeFi protocol
- Chains
- Ethereum
Reported by
Related incidents
Cite this page
SwanBluechip, "Bancor V3 hack, Jun 21, 2020: $545K lost", Crypto hack history, https://swan-hack-tracker.pages.dev/history/i/ht6bc96c3ed5/ (data as of 2026-10-31).