A data breach affecting Helsinki, Finland’s capital and largest employer, exposed sensitive personal data of over 300,000 people. The incident involved a breach in the Education Division, known as KASKO, where an outdated Cisco ASA 5515 firewall appliance was exploited. The attacker gained privileged access to internal systems and stole approximately 2TB of data, impacting city employees, childcare benefit applicants, private schools staff members, students, and their relatives.