| Nest Thermostat（Google）
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Security Grade
Calculator v1
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Google Nest Thermostat (G4CVZ)
Release Date: 2020-10-30 • Status: In sale
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Security Evaluation
1. Device Security
| Criterion
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Value
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Proof
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Comment
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| Known hardware tampering
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Rare
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🔗 Proof
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Compact sealed enclosure; physical tampering cases are uncommon.
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| Known vulnerabilities
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Rare
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🔗 Proof
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Google promptly releases security patches for critical disclosed vulnerabilities.
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| Prior attacks
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Rare
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🔗 Proof
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Large-scale public attacks targeting this thermostat are uncommon.
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| Updatability
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Very common
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🔗 Proof
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Google provides automatic long-term security firmware updates for this Nest thermostat.
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| Category Score
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Score: 2 / 3
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2. System Security
| Criterion
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Value
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Proof
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Comment
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| Authentication with other systems
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Full
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🔗 Proof
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Fully integrated into Google account and Google Home ecosystem.
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| Communications
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Encrypted with up-to-date encryption
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🔗 Proof
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TLS for cloud communication, encrypted local Google Home traffic.
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| Storage
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Encrypted with up-to-date encryption
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🔗 Proof
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Local device credentials and user schedule data are encrypted.
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| Category Score
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Score: 1 / 3
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3. User Authentication
| Criterion
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Value
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Proof
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Comment
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| Account management
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Full
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🔗 Proof
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Managed via Google account and Google Home home structure controls.
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| Authentication
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Secure
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🔗 Proof
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Google account login with two-factor authentication supported.
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| Brute-force protection
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Exist
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🔗 Proof
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Automatic lockout after repeated failed authentication attempts.
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| Event logging
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Access event logged
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🔗 Proof
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Temperature changes and remote access events are logged in Google Home.
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| Passwords
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Require change after setup with complexity requirements
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🔗 Proof
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Google accounts enforce strong password rules and security checks.
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| Category Score
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Score: 1 / 3
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Technical Specifications
| Property
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Details
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| Operating System & App
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Nest proprietary firmware (Companion App: Google Home App)
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| Hardware (CPU / GPU)
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CPU: MediaTek MT8516 • GPU: None
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| Memory & Storage
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Memory: 512 MB RAM • Storage: 2 GB flash
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| Power, Battery & Charging
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Battery: Rechargeable lithium backup battery • Power: 24V HVAC wiring • Charging: Charged via HVAC power
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| Display & Camera
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Display: Colour LCD touchscreen • Camera: No camera
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| Sound & Connectivity
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Sound: No microphone or speaker • Connectivity: Wi‑Fi 2.4GHz & 5GHz, Bluetooth 5.0
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| Physical (Dimensions & Mass)
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Dimensions: 86.5 mm × 86.5 mm × 12.9 mm • Mass: 118 g
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This Google Nest Thermostat (G4CVZ) smart thermostat runs proprietary Nest firmware. It receives automatic long-term Google security updates, uses TLS encrypted cloud communication and encrypted local home traffic. It relies on Google account two‑factor authentication, brute‑force lockout and access auditing to limit unauthorized access. Physical tampering and public exploit incidents for this model remain rare.
Secure smart thermostat with Google’s ongoing firmware updates, TLS encryption and Google account two-factor authentication.
https://store.google.com/product/nest_thermostat
