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NIHON KOHDEN CNS-6201 NULL Pointer DoS Advisory Update

⚠️ A remote NULL pointer dereference in NIHON KOHDEN CNS-6201 central monitors can be triggered by a specially crafted UDP packet, causing the monitoring process to terminate and producing a denial-of-service. The issue is unauthenticated, reproducible when UDP is reachable, and is tracked as CVE-2025-59668 with CVSS v4 8.7. Vendor support for affected versions has ended; users should migrate to successor products or apply strict network-level mitigations such as isolation, boundary devices, and careful traffic monitoring.