Sonoff S31 (S31)

Sonoff S31 (S31)
Security Grade C Calculator v	Sonoff S31 Brand: Sonoff (Parent: Sonoff) Category: Smart Plug • Model / Gen: S31 Release Date: 2020-01-01 • Status: In sale Classification Date: • Official Website

Security Evaluation

1. Device Security

Criterion	Value	Proof	Comment
Known hardware tampering	Rare	🔗 Proof	No public teardown or tampering report was reviewed for this model.
Known vulnerabilities	Rare	🔗 Proof	No exact model CVE was found in a quick NVD search; the evidence is model�level only.
Prior attacks	Rare	🔗 Proof	No model-specific attack campaign was identified in the public sources reviewed.
Updatability	Rare	🔗 Proof	The vendor support page provides firmware; the current update status depends on the installed build.
Category Score	Score: 2 / 3

2. System Security

Criterion	Value	Proof	Comment
Authentication with other systems	Partial	🔗 Proof	Management access is local or tied to the vendor account; third-party federation is not documented.
Communications	No encryption	🔗 Proof	Encrypted management may be available; the default transport was not independently verified.
Storage	Encrypted with obselete encryption	🔗 Proof	At-rest encryption is optional or undocumented; the default configuration should be checked.
Category Score	Score: 3 / 3

3. User Authentication

Criterion	Value	Proof	Comment
Account management	Basic	🔗 Proof	The device uses a single administrative account model; role separation is limited.
Authentication	Basic	🔗 Proof	Login is password-based; MFA availability depends on firmware and configuration.
Brute-force protection	Basic	🔗 Proof	Account lockout and rate limiting were not independently verified.
Event logging	Partial logging	🔗 Proof	Local event logs are available; central audit export is not documented.
Passwords	Require change after setup	🔗 Proof	Password policy depends on firmware; weak or default choices may be permitted.
Category Score	Score: 2 / 3

Technical Specifications

Property	Details
Operating System & App	Sonoff firmware (Companion App: eWeLink)
Hardware (CPU / GPU)	CPU: • GPU:
Memory & Storage	Memory: • Storage:
Power, Battery & Charging	Battery: • Power: • Charging:
Display & Camera	Display: • Camera:
Sound & Connectivity	Sound: • Connectivity: Wi-Fi 2.4 GHz
Physical (Dimensions & Mass)	Dimensions: • Mass:

Sonoff S31 is a smart plug in the Smart Plug category. Public evidence reviewed; verify the installed firmware before submission. Assessment reflects default deployment; verify the installed firmware and manual before submission.