SonicWall has alerted customers to reset their credentials following a security breach that exposed firewall configuration backup files from MySonicWall accounts. The company has responded by cutting off attacker access, collaborating with law enforcement, and providing guidance for administrators to mitigate risks associated with the exposed data. Less than 5% of SonicWall's firewall install base was affected, and the incident involved brute-force attacks on the API service for cloud backups.