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F5 discloses breach tied to nation-state threat actor

Posted on October 16, 2025October 15, 2025 by Dissent

Greg Otto reports:

F5, a company that specializes in application security and delivery technology, disclosed Wednesday that it had been the target of what it’s calling a “highly sophisticated” cyberattack, which it attributes to a nation-state actor. The announcement follows authorization from the U.S. Department of Justice, which allowed F5 to delay public disclosure of the breach under Item 1.05(c) of Form 8-K due to ongoing law enforcement considerations.

According to an 8-K form filed with the Securities and Exchange Commission, the company first became aware of unauthorized access Aug. 9 and initiated standard incident response measures, including enlisting external cybersecurity consultants. In September, the Department of Justice permitted F5 to withhold public disclosure of the breach, which the government allows if a breach is determined to be a “a substantial risk to national security or public safety.”

Investigators discovered that the threat actor maintained prolonged access to parts of F5’s infrastructure.

Read more at CyberScoop.

Category: cyberwarOf Note

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