Threat Insights: November 2025

DNV Cyber provides actionable threat insights to enable cyber leaders to make informed decisions and enhance their organization’s security posture. Get the latest trends and vulnerabilities from November 2025.

In our November 2025 threat insights, we share intel on seven timely trends and vulnerabilities, together with points to discuss and recommendations for how to address them.

Trends

• Threat actors dwelling in environments undetected
• Ransomware gangs brazenly recruiting insiders
• Denmark raises alert level for its energy sector

Vulnerabilities

• Miljödata breach hits Swedish critical infrastructure
• Master clock vulnerability discovered in maritime control systems
• Shai-Hulud attack compromises software and development tools
• Supplier breach takes European airports back to pen and paper

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