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Cleartext TransmissionWeakness · CWE-319

CVE-2026-50034

MEDIUM · 6.5 CVSS v3.1 Published 2026-06-19
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
70/100
Remediation priority · Elevated
No privileges Zero-click

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 · unedited
An attacker within BLE communication range can passively intercept wireless traffic and obtain sensitive health-related information, including glucose measurement values.

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 · moderate confidence

This vulnerability in a BLE glucose monitor allows an attacker within wireless range to passively intercept unencrypted or improperly secured BLE traffic and obtain sensitive health data including glucose measurement values. The issue stems from missing or inadequate encryption/authentication in the BLE communication protocol used by the medical device.

MitigationImplement proper BLE security using authenticated encryption (e.g., BLE Secure Connections with LE Secure Connections pairing) and ensure all health-related data transmissions are encrypted. Verify that the device requires secure pairing before data exchange.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

CVSS 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:3.1/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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify the BLE glucose monitor device
    Use a Bluetooth scanner tool (such as hcitool, blescan, or bleah) to discover nearby BLE devices and identify the glucose monitor by its advertising name or UUID. Record the MAC address and device identifier.
    Affected if The device is discovered advertising without an encrypted connection or is visible without authentication requirements.
  2. Verify BLE pairing security mode
    Attempt to connect to the device using a BLE client tool (such as gatttool or a mobile BLE scanner app). Observe the pairing requirements: check whether the device demands PIN, passkey, or numeric comparison before establishing a connection. For BLE, check if the authentication requirement is set to 'Bonding' or 'MITM protection required'.
    Affected if The device allows connection and data access without requiring authentication, or pairs without using authenticated pairing (Just Works, unauthenticated).
  3. Inspect GATT characteristic encryption for health data
    After connecting, enumerate all GATT services and characteristics. Identify characteristics related to glucose measurement (typically UUID 0x1808 for Glucose Service or vendor-specific). Check the properties of each characteristic for 'Read' and 'Notify' permissions and whether these require authentication or encryption. Use tools like gatttool with the -t random flag or a BLE debugging app to inspect characteristic properties.
    Affected if Glucose measurement characteristics are readable or notifiable without encryption or authentication flags set.
  4. Confirm encryption is applied to data transmissions
    Use a Bluetooth packet capture tool (such as Wireshark with a BLE sniffer or Ubertooth One) to intercept actual data traffic between the monitor and a paired client. Examine the ATT PDUs: verify that the Attribute Opcode is encrypted (0x1A for Read Blob Request, 0x1B for Read Multiple Request, 0x12 for Write Request) and that the Link Layer uses AES-CCM encryption.
    Affected if Packet capture shows plaintext ATT protocol traffic with glucose measurement values (typical format includes flags, sequence number, and glucose concentration in mg/dL or mmol/L) visible in cleartext.
  5. Check for proper authenticated encryption configuration
    Examine the device documentation or management interface for BLE security settings. Verify that the device is configured to use BLE Secure Connections pairing (not Legacy Pairing), and that the authentication level requires MITM (Man-in-the-Middle) protection. On Android, check the connection info under Bluetooth settings for the paired device; on iOS, use developer tools to inspect the link encryption level.
    Affected if The device uses Legacy Pairing, Just Works pairing mode, or reports 'No encryption' or 'Encryption only' without authentication for the BLE link.

A user is affected if the glucose monitor allows BLE connections without authenticated pairing, transmits glucose measurement data in plaintext, or uses unauthenticated/legacy BLE security modes.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Implement proper BLE security using authenticated encryption (e.g., BLE Secure Connections with LE Secure Connections pairing) and ensure all health-related data transmissions are encrypted. Verify that the device requires secure pairing before data exchange.

Have this fixed Scoped from the published advisory
  • Consultation4.0 h
  • Implementation12.0 h
  • Testing8.0 h
  • Review / QA4.0 h
28.0 hours of engineering $4,880
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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 sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-50034 in production — separate from our analysis above.

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What this is

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What belongs here
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