On August 9, F5 discovered that multiple systems were compromised by what it is calling a “highly sophisticated nation-state threat actor” who maintained “long-term, persistent access to certain F5 systems”. These included the BIG-IP product development environment and engineering knowledge management platform. That access allowed for the exfiltration of portions of F5’s BIG-IP source code as well as information about undisclosed BIG-IP vulnerabilities F5 was working on.