U.S.-based cybersecurity firm F5 Inc. has confirmed a breach in its internal systems, which officials and security analysts believe was orchestrated by state-backed Chinese hackers, according to a report by Bloomberg. The attack exploited vulnerabilities in F5’s widely deployed enterprise networking products, prompting urgent warnings from U.S. authorities to federal agencies and private customers.
The Cybersecurity and Infrastructure Security Agency (CISA) issued an advisory confirming that federal networks were being targeted by a “nation-state cyber threat actor” using known flaws in F5 software. Although F5 said the breach did not affect its customer-facing operations, the company acknowledged that unauthorized access had been detected in parts of its internal systems.
Hackers Maintained Access for a Year
According to Bloomberg’s report, which cited sources familiar with the matter, the hackers are believed to have been inside F5’s systems for at least 12 months before detection. The long dwell time raises serious concerns about data exposure and persistent access, potentially affecting sensitive corporate communications, source code, and network infrastructure data.
F5 CEO François Locoh-Donou is reportedly personally briefing customers about the breach timeline and mitigation steps. The company has not disclosed whether any customer information was compromised, but has begun a comprehensive forensic investigation with external security partners.
Chinese Cyber Activity Under Renewed Scrutiny
The breach adds to a growing list of China-linked cyber operations targeting critical technology suppliers, government agencies, and infrastructure networks. Recent incidents involving suspected Chinese hackers include breaches at Microsoft’s Exchange Online systems, U.S. defense contractors, and telecom infrastructure across Asia-Pacific.
While Beijing has consistently denied involvement in state-sponsored hacking, Western intelligence agencies maintain that China continues to engage in cyber espionage campaigns targeting intellectual property and defense data.
F5’s Global Impact
F5’s technology underpins critical enterprise infrastructure worldwide, powering load balancing, application security, and network performance for financial institutions, telecoms, and government networks. A successful breach of its systems could therefore pose supply-chain risks for thousands of organizations globally.
Cybersecurity experts have urged F5 customers to apply all recent software patches and adopt additional monitoring for anomalous activity. The company reiterated its commitment to transparency and emphasized that it continues to work with law enforcement and cybersecurity agencies to mitigate any further risks.
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U.S. Cyber Firm F5 Targeted in China-Linked Attack
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