Google Nest Thermostat (3rd Generation)

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Device Name	Google Nest Thermostat (3rd Generation)
Brand	Google
Type	Smart Thermostat / Home Climate Control
Released	2015
Current Firmware	Auto-updated via OTA

Device Category

Criterion	Score	Justification
Known hardware tampering	2 (Rare)	Thermostat mounted on wall and can be removed from base with simple tools. Has tamper sensor that alerts user if detached. Nest Tamper Detection
Known vulnerabilities	2 (Rare)	Some security research has identified potential issues, but Google actively patches vulnerabilities quickly. Google Security Track Record
Prior attacks	1 (None)	Thermostats have not been used in any large-scale botnet or malware campaigns. Botnet Target Analysis
Updatability	1 (Very common)	Google pushes automatic OTA firmware updates to Nest devices. Updates installed automatically. Nest Software Updates

Device Category Score: 2

Criterion	Score	Justification
Authentication with other systems	1 (Full)	Device communicates with Google cloud services using strong authentication tied to user's Google account. Nest Security
Communications	1 (Encrypted with up-to-date encryption)	All communications between thermostat and Google services use modern TLS encryption. Encryption Standards
Storage	2 (Encrypted with obsolete encryption)	Device stores limited user data and schedule information. Local storage encryption implementation has not been fully publicly documented. IoT Storage Security

System Category Score: 2

Criterion	Score	Justification
Account management	1 (Full)	Google account provides full management. Nest app supports multiple users and home members with granular permissions. Nest User Management
Authentication	1 (Secure)	Google account supports two-factor authentication. Login protected by Google's advanced security infrastructure. Google Account Security
Brute-force protection	1 (Exist)	Google has industry-leading brute-force detection and account protection mechanisms. Account Protection
Event logging	2 (Partial logging)	Temperature change history is available, but detailed security event logs and access history are not exposed to end users. Bitdefender Logging Analysis
Passwords	1 (Require change after setup with complexity requirements)	Google accounts require strong passwords with complexity requirements. 2FA is strongly recommended and increasingly enforced. Google Password Policy

User Authentication Category Score: 2

GRAS Total: 6

Final Grade: B (Moderate to Low Danger Level)

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