F5 Says Hackers Stole Undisclosed BIG-IP Flaws, Source Code

An anonymous reader quotes a report from BleepingComputer: U.S. cybersecurity company F5 disclosed that nation-state hackers breached its systems and stole undisclosed BIG-IP security vulnerabilities and source code. The company states that it first became aware of the breach on August 9, 2025, with its investigations revealing that the attackers had gained long-term access to its system, including the company's BIG-IP product development environment and engineering knowledge management platform.

F5 is a Fortune 500 tech giant specializing in cybersecurity, cloud management, and application delivery networking (ADN) applications. The company has 23,000 customers in 170 countries, and 48 of the Fortune 50 entities use its products. BIG-IP is the firm's flagship product used for application delivery and traffic management by many large enterprises worldwide.

F5 is still reviewing which customers had their configuration or implementation details stolen and will contact them with guidance. To help customers secure their F5 environments against risks stemming from the breach, the company released updates for BIG-IP, F5OS, BIG-IP Next for Kubernetes, BIG-IQ, and APM clients. Despite any evidence 'of undisclosed critical or remote code execution vulnerabilities,' the company urges customers to prioritize installing the new BIG-IP software updates.

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