Espressif ESP8266

Security Evaluation

1. Device Security

Criterion	Value	Proof	Comment
Known hardware tampering	None	🔗 Proof
Known vulnerabilities	Rare	[1] 🔗 Proof	Only one vulnerability one CVE Details
Prior attacks	Rare	🔗 Proof
Updatability	Rare	[2] 🔗 Proof	Update between 1 and 2 times a year. (But a lot of custom firmware)
Category Score	Score: 2 / 3

2. System Security

Criterion	Value	Proof	Comment
Authentication with other systems	Full	🔗 Proof
Communications	Encrypted with up-to-date encryption	🔗 Proof	Possibility to use AES128 https://fr.wikipedia.org/wiki/Advanced_Encryption_Standard
Storage	Encrypted with up-to-date encryption	🔗 Proof
Category Score	Score: 1 / 3

3. User Authentication

Criterion	Value	Proof	Comment
Account management	Absent	—	No account management on ESP8266.
Authentication	Absent	—
Brute-force protection	Absent	—
Event logging	Partial logging	🔗 Proof
Passwords	Default/Common/Easy to guess	—
Category Score	Score: 3 / 3

Technical Specifications

Property	Details
Operating System & App	(Companion App: )
Hardware (CPU / GPU)	CPU: Tensilica Xtensa LX106 core • GPU:
Memory & Storage	Memory: 64 KB SRAM • Storage: 4 MB
Power, Battery & Charging	Battery: • Power: 3.3 V DC • Charging:
Display & Camera	Display: • Camera:
Sound & Connectivity	Sound: • Connectivity: Wi-Fi, 1 x I2C, 1 x SPI, 1 x UART, 16 x I/O Pins, 1 x Analog Pin
Physical (Dimensions & Mass)	Dimensions: 24mm x 16mm x 3.4mm (0.95" x 0.63" x 0.13") • Mass: 1.72g (0.06oz)

If you're interested in microcontrollers, ESP are a good choice. You might be interessed by the ESP32, the successor of ESP8266 (but more expensive). To see which one you need you can see a comparative on this website https://makeradvisor.com/esp32-vs-esp8266/.