CVE-2019-18248

Client credential disclosure via cleartext transmission

Published Jun 29, 2020 · Updated Aug 5, 2024

Cleartext transmission of sensitive information in BIOTRONIK CardioMessenger II-S T4APP 2.20 allows attackers to disclose client credentials via adjacent access. The transmitter sends its client credentials before switching to an encrypted channel, exposing credentials used to access BIOTRONIK Home Monitoring infrastructure. A fake mobile network base station or physical access is required; disclosed credentials do not decrypt data, modify the device, or affect availability.

CVSS severity4.3
Medium
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cleartext transmission of sensitive information in BIOTRONIK CardioMessenger II-S T4APP 2.20 allows attackers to disclose client credentials via adjacent access. The transmitter sends its client credentials before switching to an encrypted channel, exposing credentials used to access BIOTRONIK Home Monitoring infrastructure. A fake mobile network base station or physical access is required; disclosed credentials do not decrypt data, modify the device, or affect availability.

The record

CVE
CVE-2019-18248
Published
Jun 29, 2020
Updated
Aug 5, 2024
Vendor
BIOTRONIK
Product
CardioMessenger II-S
Classifications
CWE-319, T1040
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 29, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=CardioMessenger II-S T-Line T4APP 2.20, CardioMessenger II-S GSM T4APP 2.20

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

BIOTRONIK · CardioMessenger II-Sversion=CardioMessenger II-S T-Line T4APP 2.20, CardioMessenger II-S GSM T4APP 2.20

Published CVSS scores

4.3BIOTRONIKCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-319Cleartext Transmission of Sensitive Information
T1040Network Sniffing

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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