Data leak [loss] $27M+

Tweet by SlowMist

2025-07-16 [vendor] BigONE
Primary Source ↗
Financial Loss $27.0M (27,000,000 USD)

Incident Details

The BigONE cryptocurrency exchange was hacked for more than $27 million, which the hacker quickly swapped for various other tokens. The attacker compromised one of the exchange’s hot wallets after gaining access to the company’s production network. BigONE stated they would fully cover the loss.Blockchain security researcher zachxbt responded to the hack by saying, “I do not feel bad for the team as this CEX processed a good bit of volume from pig butchering, romance, investment scams.” Elsewhere he suggested that hacks of “sketchy offshore exchanges” would be a positive for the crypto industry, serving as a “natural cleanse”.

Total loss estimated at $27,000,000.

Technical Details

Initial Attack Vector
Smart contract exploit / hack
Vendor / Product
BigONE

Timeline

  1. 2025-07-16 Breach occurred
  2. 2025-07-16 Publicly disclosed