CVE-2021-44905Public exploit

Lock disablement via unauthenticated Bluetooth name write

Published Mar 25, 2022 · Updated Aug 4, 2024

Incorrect Bluetooth permissions in Fortessa FTBTLD Smart Lock allow remote attackers to disable the lock by editing its name. An unauthenticated Bluetooth Low Energy characteristic exposes the device-name field as writable instead of read-only. After the name changes, the companion app refuses to connect until the lock's batteries are removed and reinserted, requiring Bluetooth proximity and causing a service interruption rather than physical unlocking.

CVSS severity8.2
High
EPSS probability1.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect Bluetooth permissions in Fortessa FTBTLD Smart Lock allow remote attackers to disable the lock by editing its name. An unauthenticated Bluetooth Low Energy characteristic exposes the device-name field as writable instead of read-only. After the name changes, the companion app refuses to connect until the lock's batteries are removed and reinserted, requiring Bluetooth proximity and causing a service interruption rather than physical unlocking.

The record

CVE
CVE-2021-44905
Published
Mar 25, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-276, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 25, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.2INCIBE-CERTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-276Incorrect Default Permissions
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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