| Kidde Smart Smoke & CO Alarm (KD2K-SM2)
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Security Grade
Calculator v1
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Kidde Smart Smoke & CO Alarm
Category: Sensor • Model / Gen: KD2K-SM2
Release Date: 2022-03-08 • Status: In 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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None
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—
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| Known vulnerabilities
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Very common
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🔗 Proof
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| Prior attacks
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Rare
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🔗 Proof
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| Updatability
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None
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—
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| Category Score
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Score: 3 / 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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—
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| Communications
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Encrypted with obselete encryption
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—
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| Storage
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No encryption
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—
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| Category Score
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Score: 3 / 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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—
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| Authentication
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Basic
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🔗 Proof
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| Brute-force protection
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Absent
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—
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| Event logging
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Partial logging
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—
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| Passwords
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Default/Common/Easy to guess
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—
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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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RTOS (Companion App: )
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| Hardware (CPU / GPU)
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CPU: ARM Cortex-M4 • GPU: None
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| Memory & Storage
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Memory: 64 KB RAM • Storage: 512 KB Flash
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| Power, Battery & Charging
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Battery: AA batteries x 3 • Power: Battery powered • Charging:
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| Display & Camera
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Display: LED status light • Camera: None
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| Sound & Connectivity
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Sound: • Connectivity: 2.4GHz Wi-Fi, Z-Wave
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| Physical (Dimensions & Mass)
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Dimensions: None • Mass: None
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CVE-2024-23738 is a command injection flaw in the Kidde Smart smoke and carbon monoxide alarms (CVSS 9.8, Critical). An attacker on the local network can send a crafted command to the device, which causes a denial-of-service condition and may allow code execution. If the alarm is disabled by an attacker, it no longer warns the residents about smoke or carbon monoxide, which creates a direct physical safety risk. The device receives firmware updates rarely, so the exposure lasts a long time.
