Hackers Had Been Lurking in Cyber Firm F5 Systems Since 2023

The state-backed hackers who breached cybersecurity company F5 Inc. broke in beginning in late 2023 and lurked in the company’s systems until being discovered in August of this year, according to people who were briefed by F5 about the incident.

The attackers penetrated F5’s computer systems by exploiting software from the company that had been left vulnerable and exposed to the internet, according to the people. F5 told customers that the hackers were able to break in after the firm’s staff failed to follow the cybersecurity guidelines it provides customers, said the people, who spoke on the condition that they ...