Denmark's critical infrastructure faced the biggest online attack in the country's history in May, with 22 companies breached and some forced to enter island mode operation.
In almost all cases unpatched vulnerabilities in Zyxel firewalls meant compromise was possible, and in some the attackers appeared well-resourced, exploiting vulnerabilities that weren't publicly announced (zero days).
As the Zyxel devices weren't visible on public scanning services such as Shodan, SektorCERT believes Danish critical infrastructure was targeted specifically.
#Denmark #online attack #critical infrastructure #cybersecurity #Zyxel firewalls #vulnerabilities #Sandworm #SektorCERT
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