Internet security nonprofit Shadowserver Foundation has found more than 266,000 F5 BIG-IP instances exposed online after the security breach disclosed by cybersecurity company F5 this week. The company revealed on Wednesday that nation-state hackers breached its network and stole source code and information on undisclosed BIG-IP security flaws, but found no evidence that the attackers had leaked or exploited the undisclosed vulnerabilities in attacks. The same day, F5 also issued patches to address 44 vulnerabilities (including the ones stolen in the cyberattack) and urged customers to update their devices as soon as possible. "Updates for BIG-IP, F5OS, BIG-IP Next for Kubernetes, BIG-IQ, and APM clients are available now," the company said. "Though we have no knowledge of undisclosed…