SonicWall cloud backup breach exposed firewall config files of many global customers Attackers brute-forced MySonicWall, risking credential leaks and targeted network intrusions SonicWall urges users to delete backups, rotate secrets, and recreate configurations locally All companies using SonicWall’s MySonicWall cloud backup feature have had their firewall configuration files exposed in a recent cyberattack, the company has admitted. After initially claiming “fewer than 5%” of its customer