In yet more news of major cyber intrusions, submarine network cable operator Pacnet was hit by a major cyber attack just weeks before Telstra completed its acquisition of the company:

Asia’s largest undersea submarine cable company Pacnet was hacked into by unknown hackers. The company which has recently been acquired by Australian telecommunications giant Telstra today confirmed that it has been the victim of a cyberattack[sic] targeting its email and administration systems and potentially exposing sensitive data of thousands of business and government customers.

Spokesperson for Telstra said that an unauthorised third party had been able to gain access to the Pacnet business management systems through a malicious software installed via a vulnerability on an SQL server.

Where is the line in the sand drawn between what is considered a major and non-major cyber attack?