Fabrication Outside Contract - Suppliers produce more than agreed and they sell them fraudulently

Device advertised as another, posing as it but is an underperforming or older version, or manufacturer reject, discarded devices that are fraudulently sold as new

Stolen intellectual property or reverse-engineered hardware

Fake device certifications and forged changelogs

Silicon Time Bomb - Faulty chip that can have disastrous consequences
Backdoor - Malicious hardware disguised as legitimate