CEH IoT security modules describe insecure network services as vulnerabilities arising when IoT devices communicate over unencrypted channels, use unauthenticated update mechanisms, or expose services that fail to validate data integrity. When operational commands and firmware updates are transmitted over HTTP without cryptographic safeguards, attackers can intercept, replay, or modify the data stream. Firmware integrity verification is a critical component of secure device lifecycle management. Without it, adversaries can perform firmware injection, allowing them remote control, persistent compromise, or sabotage of device functionality. This aligns directly with insecure network services, which CEH defines as improperly protected communication mechanisms and service interactions within IoT ecosystems. Insecure ecosystem interfaces generally relate to cloud APIs and web dashboards, insecure default settings involve weak credentials or factory configurations, and insufficient privacy protection relates to data confidentiality rather than command manipulation. The described scenario most clearly fits insecure network services.