Can Smart Locks Be Hacked? Separating Real Risk From Hype
"Can smart locks be hacked?" gets sensational headlines and a genuinely boring, practical answer: yes, in a few specific and mostly preventable ways, and the mechanical lock underneath is usually still the actual weak point, not the electronics.
The real risk categories, honestly ranked
1. A weak or reused app account password — the biggest real risk
Most smart lock "hacks" that make headlines aren't clever Bluetooth exploits — they're an attacker who obtained a reused password from an unrelated data breach and tried it on the lock's app account. This is entirely preventable: a unique, sufficiently long password (or better, a passphrase) closes it completely. An 8-character password with common character variety falls in days against a serious offline attack; 12+ characters pushes that to effectively never — see the actual numbers in how strong is your password, really, or check your own in the Password Entropy Calculator. Enable two-factor authentication on the account if the manufacturer supports it — this closes the door on password reuse entirely.
2. A weak keypad PIN with no lockout
If the smart lock has a keypad, it inherits ordinary keypad brute-force math. A short PIN with no lockout is genuinely weak — falling in well under a minute to basic automation; adding a lockout after a handful of wrong tries changes that to days. Full math in how long a 4-digit keypad lock actually takes to crack.
3. Bluetooth/Wi-Fi protocol vulnerabilities — real, but narrower than headlines suggest
Specific models have had genuine, disclosed vulnerabilities in their wireless implementation — relay attacks, replay attacks, or weak default pairing. A relay attack, specifically, works by two attackers using radio equipment to extend the effective range between a legitimate credential (a phone or fob) and the lock — one attacker stands near the credential holder, the other near the lock, and their equipment relays the signal as if the credential were physically present. This is real for some proximity-based unlock systems but requires specific equipment, proximity to the legitimate credential holder, and generally isn't a remote, work-from-anywhere attack the way headlines sometimes imply. These vulnerabilities are typically model-specific and patched once disclosed, which is exactly why firmware updates matter for a smart lock in a way they never did for a mechanical one.
4. The mechanical lock is still there, and still the more common failure point
A smart lock with weak underlying ANSI/BHMA hardware is vulnerable to the same kick-in or pry-bar attack any weak mechanical lock is — electronics don't change that math at all. See mechanical vs. smart deadbolts for why the grade underneath still matters most.
Risk severity, compared honestly
| Risk | How common in practice | How preventable |
|---|---|---|
| Weak/reused account password | The most common real-world cause of account compromise | Completely — unique strong password + 2FA |
| Weak PIN, no lockout | Common on default configurations | Completely — enable lockout, use 6+ digits |
| Bluetooth/Wi-Fi protocol exploit | Uncommon, model-specific, usually patched once found | Mostly — keep firmware current, buy from a vendor with a patch track record |
| Ungraded/weak mechanical bolt | Common on cheap retrofit models | Completely — verify ANSI/BHMA grade before buying |
Practical mitigations, in order of impact
- Unique, long password on the app account — a password manager, not something reused or memorable.
- Two-factor authentication enabled, if supported.
- A 6-digit (not 4-digit) PIN with lockout enabled, if the lock has a keypad.
- Firmware kept up to date — set automatic updates if the manufacturer offers them.
- A reputable manufacturer with a track record of patching disclosed vulnerabilities, not the cheapest available option.
- A real ANSI/BHMA grade on the mechanical bolt — this is still doing more security work than any of the above.
What "hacked" actually looked like in reported real-world cases
The publicly disclosed smart-lock vulnerabilities that get media attention are typically found and reported by security researchers under responsible-disclosure practices — meaning the manufacturer is notified and given time to patch before the finding is published. This is a genuinely healthy pattern: a disclosed and patched vulnerability in a lock still being sold means the class of flaw is now closed for everyone with current firmware, versus an unknown, undisclosed vulnerability sitting unpatched. A smart lock manufacturer with disclosed-and-patched vulnerabilities in its history is not automatically worse than one with none disclosed — it may simply mean nobody's looked as closely, or means the manufacturer engages constructively with the research community rather than suppressing findings.
Signs a specific smart lock model is a worse-than-average security choice
- No published firmware update history or no way to check current firmware version in the app — a product that's never visibly updated may simply never have needed to, but it's not verifiable either way.
- No 2FA option on the account, at all, on a product marketed for remote access — this is a basic account-security feature that's inexpensive for a manufacturer to add, and its absence is a signal about how seriously security was prioritized in the product's design.
- No stated ANSI/BHMA grade anywhere in the documentation — see mechanical vs. smart deadbolts for why this matters independent of the electronics question entirely.
- A company with no public security contact or disclosure policy — legitimate manufacturers generally provide a way for researchers to report findings responsibly; the absence of one is a minor but real signal.
FAQ
Can someone unlock my smart lock remotely from across the world?
For the vast majority of reported real vulnerabilities, no — most require physical proximity (Bluetooth range, or physical access to attempt PIN entry) rather than a purely remote exploit. The account-compromise path (a stolen password used remotely) is the exception, which is exactly why account security is the top mitigation on this list.
Are cheaper smart locks less secure than expensive ones?
Not automatically by price alone, but cheaper models more often skip ANSI/BHMA certification and may have less rigorous security testing and slower patch response — verify the specific product's grade and update history rather than assuming price is a reliable proxy.
Should I avoid smart locks entirely if I'm risk-averse?
Not necessarily — a well-configured smart lock (strong password, 2FA, current firmware, real ANSI grade) is not meaningfully riskier than a mechanical lock, and a poorly-configured one is genuinely risky. The configuration matters more than the category of product.
How do I know if my smart lock has any disclosed vulnerabilities?
Check the manufacturer's security advisories page if they publish one, and keep firmware set to auto-update — this is the most reliable way to stay protected without personally tracking every disclosure.
Does using a smart lock's PIN-sharing feature for a guest create extra risk?
Not meaningfully, as long as the shared code is temporary and set to expire or is manually revoked after use — the real risk in guest-code sharing is forgetting to revoke it, not the sharing mechanism itself.
The honest bottom line
A smart lock set up with a strong unique password, 2FA where available, current firmware, and a genuine ANSI/BHMA-graded bolt is not meaningfully easier to defeat than a good mechanical deadbolt — and it adds real conveniences a mechanical lock can't. A smart lock with a reused four-character app password and a Grade-3-or-unrated bolt is a liability regardless of how many app features it has. The technology isn't the risk; the setup is.