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Cyber security researchers have exposed a vulnerability in the RADIUS protocol, dubbed BlastRADIUS. While there is no evidence that threat actors are actively exploiting it, the team is calling for every RADIUS server to be upgraded. What is the RADIUS protocol? RADIUS, or Remote Authentication Dial-In User Service, is a networking protocol that provides centralised authentication, authorisation and accounting for users connecting to a network service. It is widely used by internet service providers and…