Xiaomi Smart Band 8

Security Grade

Calculator v1

Xiaomi Smart Band 8

   Brand: Xiaomi (Parent: Xiaomi Corporation)

   Category: Fitness Tracker • Model / Gen: 8 M2239B1

   Release Date: 2023-04-18 • Status: End of sale

   Classification Date: 2025-10-15 • Official Website

Security Evaluation

Criterion	Value	Proof	Comment
Known hardware tampering	None	🔗 Proof	As a sealed, low-cost consumer device, there are no documented cases of widespread hardware tampering or built-in hardware security features like a secure enclave.
Known vulnerabilities	Rare	https://www.bleepingcomputer.com/news/security/new-bluetooth-flaw-lets-attackers-impersonate-devices/ 🔗 Proof	Older models had documented Bluetooth vulnerabilities. While this model is newer, the potential for similar Bluetooth-level vulnerabilities exists, though none are widely reported for this specific model yet.
Prior attacks	None	🔗 Proof	There are no publicly documented widespread, targeted attacks specifically against the Xiaomi Smart Band 8. Most issues are theoretical or related to general platform vulnerabilities.
Updatability	Very common	🔗 Proof	Xiaomi frequently pushes firmware updates through the Mi Fitness companion app to fix bugs and add features.
Category Score	Score: 2 / 3

Criterion	Value	Proof	Comment
Authentication with other systems	Partial	🔗 Proof	The band can be used to unlock the paired smartphone, but it doesn't serve as a full security key for authenticating with third-party systems. Its integration is limited to the Mi Fitness ecosystem.
Communications	Encrypted with up-to-date encryption	🔗 Proof	Communication between the band and the phone is via Bluetooth 5.1 LE, which supports encryption. Data synced to Xiaomi's cloud is also transmitted over encrypted channels (HTTPS).
Storage	No encryption	🔗 Proof	There is no evidence or documentation to suggest that the limited data stored temporarily on the band itself (before syncing) is encrypted. This is typical for fitness trackers in this price range.
Category Score	Score: 2 / 3

Criterion	Value	Proof	Comment
Account management	Full	🔗 Proof	All data and settings are tied to a Xiaomi Account, which allows for password changes, data management, and supports two-factor authentication for enhanced security.
Authentication	Absent	🔗 Proof	The device itself has no passcode or biometric authentication. Security relies entirely on the physical proximity to the paired and unlocked smartphone.
Brute-force protection	Absent	🔗 Proof	The device has no on-device password, so brute-force attacks are not applicable at the device level. Protection exists at the associated Xiaomi Account level, but not on the band itself.
Event logging	Partial logging	🔗 Proof	The Xiaomi Account system logs sign-in events from different devices, which can be viewed by the user. However, the band itself does not provide detailed security event logs.
Passwords	Default/Common/Easy to guess	🔗 Proof	This is interpreted as there being no password on the device at all. Anyone who picks up the device can swipe through its menus and see recent fitness data.
Category Score	Score: 3 / 3

Property	Details
Operating System & App	Proprietary Xiaomi OS (Companion App: Mi Fitness)
Hardware (CPU / GPU)	CPU: Dialog DA14706 • GPU: N/A
Memory & Storage	Memory: • Storage:
Power, Battery & Charging	Battery: 190mAh • Power: Lithium-ion polymer • Charging: Magnetic charging
Display & Camera	Display: 1.62" AMOLED Touch Display • Camera: None
Sound & Connectivity	Sound: Vibration motor only • Connectivity: Bluetooth 5.1 LE
Physical (Dimensions & Mass)	Dimensions: 48 x 22.5 x 10.99 mm • Mass: 27g (with strap)