Cyber Brief 25-10 - September 2025

**Executive summary:** This brief compiles open-source reporting on multiple concurrent high-impact cyber events across Europe and globally, covering nation-state APT operations, active zero-day exploitation and critical vulnerabilities, large-scale cybercrime and supply-chain compromises, disruptive attacks affecting transportation and elections, and emerging threats such as AI-driven ransomware—providing an overview of incidents, affected sectors, and attacker TTPs.