“Significant” threat to US networks after hackers steal F5 source code, CISA warns


  • CISA Warns FCEB Agencies to Fix F5 Products After Nation-State Breach
  • Attackers stole BIG-IP source code and vulnerability data, risking zero-day discovery and exploitation.
  • F5 released updates; no exploitation confirmed yet, but federal networks face imminent threat

The US Cybersecurity and Infrastructure Security Agency (CISA) is urging federal Civilian Executive Branch (FCEB) agencies to catalog and patch F5 products in their technology stack, after hackers broke into the company and stole source code and other sensitive information.

In Emergency Directive ED 26-01, CISA stated that a “nation-state-affiliated cyber threat actor” had exfiltrated the F5 files, including part of its BIG-IP source code, and vulnerability information. With this intelligence, attackers can analyze F5 products, potentially discover zero-day vulnerabilities, and develop exploits and malware.

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