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| Shelly 1PM (SHELLY1PM)
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Security Grade
Calculator v1
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Shelly 1PM
Release Date: 2017-01-01 • Status: End of sale
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Security Evaluation
1. Device Security
| Criterion
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Value
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Proof
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Comment
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| Known hardware tampering
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Rare
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🔗 Proof
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In-wall / DIN-rail installation limits casual physical access; PCB and terminals remain reachable once the enclosure is opened.
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| Known vulnerabilities
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Rare
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🔗 Proof
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CVE-2025-11243 is documented on the Shelly Pro 4PM line; the 1PM is not listed among affected products.
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| Prior attacks
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None
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🔗 Proof
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No public report of botnet recruitment or mass exploitation targeting Shelly relays.
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| Updatability
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Very common
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🔗 Proof
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Vendor shipped firmware 1.6.0 to remediate CVE-2025-11243, showing an active OTA update process
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| Category Score
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Score: 2 / 3
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2. System Security
| Criterion
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Value
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Proof
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Comment
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| Authentication with other systems
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Partial
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🔗 Proof
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Local HTTP / WebSocket / MQTT RPC interfaces are exposed; credential protection must be enabled by the user and is off by default.
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| Communications
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Encrypted with up-to-date encryption
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🔗 Proof
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Cloud and MQTT traffic use TLS; the local HTTP endpoint on port 80 remains unencrypted.
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| Storage
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Encrypted with obselete encryption
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🔗 Proof
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No vendor documentation of encryption at rest for configuration and Wi-Fi credentials stored in flash.
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| Category Score
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Score: 2 / 3
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3. User Authentication
| Criterion
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Value
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Proof
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Comment
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| Account management
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Basic
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🔗 Proof
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Shelly Cloud account with limited role separation.
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| Authentication
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Basic
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🔗 Proof
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Local web UI credentials must be activated manually by the user.
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| Brute-force protection
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Absent
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🔗 Proof
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CVE-2025-11243 is pre-authentication: the crash is triggered during parsing, before authentication and ACL checks, so no lockout applies.
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| Event logging
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Partial logging
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🔗 Proof
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Only limited activity history is available in the app.
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| Passwords
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Require change after setup
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🔗 Proof
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Credentials set at commissioning, without documented complexity enforcement.
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| Category Score
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Score: 3 / 3
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Technical Specifications
| Property
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Details
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| Operating System & App
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Embedded firmware (ESP8266) (Companion App: Shelly Smart Control)
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| Hardware (CPU / GPU)
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CPU: ESP8266 • GPU:
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| Memory & Storage
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Memory: ~50 KB SRAM • Storage: 2 MB Flash
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| Power, Battery & Charging
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Battery: • Power: 110–240 VAC / 24–60 VDC, <1 W • Charging:
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| Display & Camera
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Display: • Camera:
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| Sound & Connectivity
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Sound: • Connectivity: Wi-Fi 802.11 b/g/n (2.4 GHz), MQTT, CoAP
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| Physical (Dimensions & Mass)
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Dimensions: 36 × 41 × 17 mm • Mass: N/A
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Overall assessment: The Shelly 1PM is a competent Gen1 Wi-Fi relay with active OTA support and TLS-protected cloud/MQTT channels. Its main weaknesses are opt-in local authentication (off by default), no brute-force lockout, unencrypted local HTTP, and no documented encryption at rest for Wi-Fi credentials. Known CVE-2025-11243 affects the Shelly Pro line, not this model, but it demonstrates weaknesses in the shared local API design.
