1. To find a way around or bypass security measures, systems, or protocols
The hacker tried to circumvent security to access the database.
O hacker tentou contornar a segurança para acessar o banco de dados.
2. To evade or avoid security restrictions through clever or unauthorized means
They circumvented security by using a backdoor in the system.
Eles contornaram a segurança usando uma porta dos fundos no sistema.