F5 discloses nation-state cyber breach; BIG-IP source code exfiltrated; director resigns for new role

F5, INC.

Nation-state threat actor exfiltrated BIG-IP source code and undisclosed vulnerability details; access since August 2025.
No evidence of active exploitation or software supply chain modification; containment efforts successful.
Configuration or implementation info for a small % of customers exfiltrated; affected customers will be contacted.
Director Michael Montoya resigned from board (no disagreement), appointed Chief Technology Operations Officer, reporting to CEO.
F5 released security updates for BIG-IP, F5OS, BIG-IP Next, BIG-IQ, and APM clients; customers advised to update.

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