Cybersecurity Risks in Smart Locks — and How to Mitigate Them

Smart locks add convenience but introduce digital attack vectors that traditional locks don't have. Here's what the real risks are and how to address them.

2025-06-15 · 5 min read · Smart Locks

Smart locks are increasingly common in Miami homes and commercial properties — the combination of keyless convenience and remote management is genuinely useful. But they introduce cybersecurity considerations that are completely absent from traditional mechanical locks. Understanding these risks allows you to make informed decisions and implement appropriate mitigations.

Bluetooth Vulnerabilities

Most consumer smart locks use Bluetooth Low Energy (BLE) for proximity-based unlocking. BLE has been the subject of multiple published attacks:

• Relay attacks: A device near your phone can capture and relay the BLE signal to a second device near your lock, fooling the lock into thinking your phone is nearby even when it's far away.
• Signal sniffing: BLE signals can be captured and replayed if the implementation doesn't use proper cryptographic rolling codes.
• Bluejacking/Bluesnarfing: More theoretical for smart locks but relevant for the broader Bluetooth attack surface.

Mitigation: Choose locks that explicitly state they use encrypted rolling codes. August and Schlage Encode have documented their implementations; both use cryptographic protections that address replay attacks.

Wi-Fi Connected Locks and Cloud Dependencies

Locks that connect directly to your Wi-Fi and use cloud services for remote access introduce a different attack surface: - Your home Wi-Fi is now connected to your physical lock - The cloud service provider's security practices directly affect your physical security - Service outages mean the remote management features don't work (physical key access still works, but app control doesn't)

Mitigation: Use a dedicated IoT Wi-Fi network (most modern routers support multiple SSIDs) to isolate smart locks from computers and phones. Use strong, unique passwords for lock accounts and enable multi-factor authentication.

Default Password Issues

Many smart locks ship with default admin credentials for the management interface or Bluetooth pairing. Failure to change these is the most common vulnerability in deployed smart locks.

Mitigation: Follow the full setup process including changing all default credentials. Most reputable locks (Schlage, Yale, Kwikset) require password setup during initial configuration — verify this was completed.

Physical Keyboard Attacks

If you use a keypad code, observe your surroundings when entering it. In Miami's mixed-use urban environments (Brickell, Midtown, South Beach), someone nearby may observe your code entry.

Mitigation: Use six-digit codes rather than four-digit. Enable auto-lockout after failed attempts. Some keypads support "shuffle mode" where the digit positions randomize, preventing observation-based code theft.

What the Real Risk Profile Actually Is

Smart lock cybersecurity attacks, while real, are less common than: - Physical attacks on the lock hardware - Social engineering (posing as maintenance) - Stolen physical keys

The realistic threat model for most Miami homeowners is a combination of physical hardening AND basic cybersecurity hygiene — not one or the other.

Caraballo Locksmith installs and configures smart locks with a security-first approach, including secure initial setup, code management best practices, and integration with existing alarm systems.