CVE-2014-10374
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedOn Fitbit activity-tracker devices, certain addresses never change. According to the popets-2019-0036.pdf document, this leads to "permanent trackability" and "considerable privacy concerns" without a user-accessible anonymization feature. The devices, such as Charge 2, transmit Bluetooth Low Energy (BLE) advertising packets with a TxAdd flag indicating random addresses, but the addresses remain constant. If devices come within BLE range at one or more locations where an adversary has set up passive sniffing, the adversary can determine whether the same device has entered one of these locations.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceFitbit activity trackers (including Charge 2) transmit BLE advertising packets with a TxAdd flag indicating random addresses, but the addresses remain constant over time. This allows permanent device tracking when adversaries with passive BLE sniffers monitor devices at multiple locations.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE dataall versionsCVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Adjacent
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify the Fitbit device modelCheck the physical device for the model name/number, or view paired device details in the Fitbit app or computer pairing settingsAffected if The device is a Fitbit Charge 2
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Enable BLE scanning on a separate deviceUse a BLE sniffer app, a second BLE-enabled device with scanning capability (such as a smartphone with a BLE scanner app or dedicated BLE analysis hardware), to discover and record advertising packets from the Fitbit deviceAffected if The Fitbit device is transmitting BLE advertising packets
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Capture multiple BLE advertising samples over timeRecord the BLE MAC address from advertising packets at different times (wait at least several minutes between captures) and compare the addresses observedAffected if The MAC address remains identical across samples taken at different times
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Verify the address type flagExamine the advertising packet data to check the TxAdd flag value (should be set to 1 for random addresses), then confirm if that random address stays the same across multiple advertising eventsAffected if The TxAdd flag indicates random addresses but the address value does not change over time
If the device is a Fitbit Charge 2 and the BLE MAC address remains constant across multiple advertising packets captured over time (despite the TxAdd flag indicating random addressing), the environment is affected by this tracking vulnerability.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataThis is a firmware-level vulnerability requiring a fix from Fitbit. Users should check for and apply device firmware updates when available. Until a fix is released, users should be aware of tracking risks in public spaces with BLE monitoring.
- Consultation3.0 h
- Implementation1.0 h
- Testing3.0 h
- Review / QA2.0 h
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2014-10374 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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