Xiaomi Smart Band 8(M2239B1)

Security Evaluation

1. Device Security

Criterion	Value	Proof	Comment
Known hardware tampering	None	🔗 Proof	No known public method for hardware tampering.
Known vulnerabilities	Rare	🔗 Proof	Almost no publicly reported vulnerabilities for this model; rare vulnerabilities exist in the broader wearable ecosystem.
Prior attacks	None	🔗 Proof	Has not been identified in IoT botnet attacks or real-world exploitation campaigns.
Updatability	Very common	🔗 Proof	Supported via OTA firmware updates through the official Mi Fitness mobile application.
Category Score	Score: 2 / 3

2. System Security

Criterion	Value	Proof	Comment
Authentication with other systems	Partial	🔗 Proof	BLE pairing authentication with limited mutual authentication across system components.
Communications	Encrypted with up-to-date encryption	🔗 Proof	Communicates using secure BLE pairing and encrypted data transmission.
Storage	Encrypted with up-to-date encryption	🔗 Proof	Local health data is stored directly on the band with encryption.
Category Score	Score: 2 / 3

3. User Authentication

Criterion	Value	Proof	Comment
Account management	Full	🔗 Proof	Xiaomi account supports complete permission management, account deletion, and password reset.
Authentication	Basic	🔗 Proof	Xiaomi account password with optional cloud 2FA; band itself uses a basic local unlock password.
Brute-force protection	Exist	🔗 Proof	Rate limits on Xiaomi cloud login attempts and local password retry limit on the band.
Event logging	Partial logging	🔗 Proof	Sync history is visible in the Mi Fitness App; complete security audit logs are not accessible.
Passwords	Require change after setup with complexity requirements	🔗 Proof	Xiaomi account enforces password complexity rules, though local band unlock password only enforces simple length requirements.
Category Score	Score: 2 / 3

Technical Specifications

Property	Details
Operating System & App	(Companion App: Mi Fitness)
Hardware (CPU / GPU)	CPU: • GPU:
Memory & Storage	Memory: • Storage:
Power, Battery & Charging	Battery: • Power: • Charging:
Display & Camera	Display: • Camera:
Sound & Connectivity	Sound: • Connectivity: Bluetooth 5.1 BLE
Physical (Dimensions & Mass)	Dimensions: • Mass: