Nest Learning Thermostat (4th Gen)（G4CVZ）
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| Nest Learning Thermostat (4th Gen)（G4CVZ） | ||
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Security Grade
Calculator v1
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Google Nest Learning Thermostat (4th Generation)
Brand: Nest / Google (Parent: Alphabet Inc.) Category: Smart Thermostat / IoT Climate Device • Model / Gen: 4th Generation G4CVZ Release Date: 2024-08-01 • Status: In sale Classification Date: 2026-10-27 • Official Website | |
Contents
Security Evaluation
1. Device Security
| Criterion | Value | Proof | Comment |
|---|---|---|---|
| Known hardware tampering | Rare | [[1](https://store.google.com) 🔗 Proof] | Hardware modification uncommon |
| Known vulnerabilities | Rare | [[2](https://support.google.com/googlenest) 🔗 Proof] | Few public CVEs; Google pushes regular OTA patches |
| Prior attacks | Rare | [[3](https://store.google.com) 🔗 Proof] | No widespread mass attacks targeting 4th gen |
| Updatability | Very common | [[4](https://support.google.com/googlenest) 🔗 Proof] | Automatic OTA firmware updates |
| Category Score | Score: 2 / 3 | ||
2. System Security
| Criterion | Value | Proof | Comment |
|---|---|---|---|
| Authentication with other systems | Partial | [[5](https://store.google.com) 🔗 Proof] | Integrates with Google Assistant, Google Home ecosystem |
| Communications | Encrypted with up-to-date encryption | 🔗 Proof | TLS 1.3 and AES encryption for cloud communication |
| Storage | Encrypted with up-to-date encryption | 🔗 Proof | Usage/history data encrypted at rest in Google cloud |
| Category Score | Score: 2 / 3 | ||
3. User Authentication
| Criterion | Value | Proof | Comment |
|---|---|---|---|
| Account management | Full | 🔗 Proof | Google account management, home sharing |
| Authentication | Secure | 🔗 Proof | Google account login + supports 2FA |
| Brute-force protection | Exist | 🔗 Proof | Google account rate limiting / lockout |
| Event logging | Access event logged | 🔗 Proof | Logs logins, temperature schedule, occupancy events |
| Passwords | Require change after setup with complexity requirements | 🔗 Proof | Google enforces strong password rules |
| Category Score | Score: 1 / 3 | ||
Technical Specifications
| Property | Details |
|---|---|
| Operating System & App | Nest embedded OS (Companion App: Google Home / Nest App) |
| Hardware (CPU / GPU) | CPU: ARM embedded processor • GPU: No dedicated GPU |
| Memory & Storage | Memory: 512 MB RAM • Storage: 4 GB flash |
| Power, Battery & Charging | Battery: Internal rechargeable battery, charged via HVAC wiring • Power: HVAC 24V AC / USB-C backup charging • Charging: USB-C backup charging |
| Display & Camera | Display: Round colour LCD • Camera: No camera |
| Sound & Connectivity | Sound: Small speaker for status alerts • Connectivity: Wi‑Fi 2.4GHz / 5GHz, Bluetooth |
| Physical (Dimensions & Mass) | Dimensions: Φ90 mm × 22 mm • Mass: 214 g |
4th-gen Nest Learning Thermostat learns user temperature preferences and tracks occupancy/schedule data. It has no camera, reducing visual privacy risk, but activity data is sent to Google cloud. Receives regular OTA security updates.
