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F5 disclosed a year-long cyberattack by a China-linked group, leading to stock drop, legal probes, and urgent federal patching orders.
On October 15, 2025, F5, Inc. disclosed a prolonged cyber breach by a China-linked nation-state actor, UNC5221, who accessed its BIG-IP development systems for over a year, stealing source code and vulnerability details.
The revelation caused F5’s stock to drop 10.7%, triggering investigations by multiple law firms over potential securities law violations due to alleged failure to disclose material risks.
CISA issued an emergency directive requiring federal agencies to patch or disconnect vulnerable F5 devices.
Experts warn of heightened risks from stolen data, urging immediate action to mitigate threats from newly exposed vulnerabilities.
F5 reveló un ataque cibernético de un año por un grupo vinculado a China, lo que llevó a la caída de las acciones, investigaciones legales y órdenes federales urgentes de parcheo.