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Investing.com -- F5 Inc (NASDAQ:FFIV) stock fell 5% on Wednesday after the company disclosed a sophisticated nation-state cyberattack that compromised its BIG-IP product development environment.
In a regulatory filing, F5 revealed it discovered the unauthorized access on August 9, 2025, when a "highly sophisticated nation-state threat actor" gained entry to certain company systems. The threat actor maintained "long-term, persistent access" to F5’s systems, including its BIG-IP product development environment and engineering knowledge management platform.
The company stated that certain files were exfiltrated during the breach, including portions of the BIG-IP source code and information about undisclosed vulnerabilities. However, F5 noted it is "not aware of any undisclosed critical or remote code vulnerabilities" and has "no evidence of modification to our software supply chain."
F5 said its containment actions have been successful and it has not observed evidence of new unauthorized activity since initiating its response. The company is working with federal law enforcement and implementing additional security measures to strengthen its environment.
The U.S. Department of Justice had previously determined that a delay in public disclosure was warranted, according to the filing. F5 stated that as of the disclosure date, the incident "has not had a material impact on the Company’s operations," though it is still evaluating potential financial impacts.
The company confirmed that its NGINX source code, F5 Distributed Cloud Services, and Silverline systems were not accessed or modified during the breach.
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