Hack history / 2021 / Hack or exploit
Polydex
Hack or exploit on Jun 20, 2021 · Reentrancy
SOURCES AGREE ON DATE AND LOSS · 2 SOURCES
Lost
$500K
dollars at the time
Returned
none listed
as the sources state it
Rank
#1,158
among thefts by dollars lost
What happened
A reentrancy vulnerability in the PLX Locker smart contract exploiting ERC777 token callbacks allowed an attacker to recursively call withdraw functions and drain 500K worth of assets. The attacker bridged stolen funds to Ethereum before the team could patch the timelock-delayed fix.
Details
- Date
- Jun 20, 2021
- Kind
- Hack or exploit
- Method
- Reentrancy
- How in
- Smart contract bug
- Target
- DeFi protocol
- Chains
- Polygon
Reported by
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BurgerSwap 2021 · Hack or exploit · $7.2M
CREAM Lending 2021 · Hack or exploit · $18.8M
flash.sx / vaults.sx 2021 · Hack or exploit · $13M
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Cite this page
SwanBluechip, "Polydex hack, Jun 20, 2021: $500K lost", Crypto hack history, https://swan-hack-tracker.pages.dev/history/i/htb8258216b1/ (data as of 2026-10-31).