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After reading the technical details about this zero-day that targeted governmental entities and a think tank in Europe and learning about the Winter Vivern threat actor, get tips on mitigating this cybersecurity attack. ESET researcher Matthieu Faou has exposed a new cyberattack from a cyberespionage threat actor known as Winter Vivern, whose interests align with Russia and Belarus. The attack focused on exploiting a zero-day vulnerability in Roundcube webmail, with the result being the ability…