Whitehat Gerhard Wagner submitted a critical vulnerability on October 5th, 2021 that affected the Polygon Plasma Bridge. The vulnerability allowed an attacker to exit their burn transaction from the bridge multiple times, up to 223 times. There was around ~$850M at risk. Having just $100k to launch the attack with would result in $22.3M in losses!
The whitehat received a payout of $2m from Polygon, which is the highest bounty ever paid out in history.
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