CVE-2019-18246

Adjacent communication interception via missing mutual authentication

Published Jun 29, 2020 · Updated Aug 5, 2024

Improper authentication in BIOTRONIK CardioMessenger II-S T4APP 2.20 allows adjacent attackers to influence remote-monitoring communications. The connection setup fails to verify both endpoints, permitting a fake mobile base station to interfere with the device-to-gateway exchange. Adjacent radio access or physical device access is required; the exposed path cannot decrypt or forge patient data, alter the device, or interrupt service.

CVSS severity4.3
Medium
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in BIOTRONIK CardioMessenger II-S T4APP 2.20 allows adjacent attackers to influence remote-monitoring communications. The connection setup fails to verify both endpoints, permitting a fake mobile base station to interfere with the device-to-gateway exchange. Adjacent radio access or physical device access is required; the exposed path cannot decrypt or forge patient data, alter the device, or interrupt service.

The record

CVE
CVE-2019-18246
Published
Jun 29, 2020
Updated
Aug 5, 2024
Vendor
BIOTRONIK
Product
CardioMessenger II-S
Classifications
CWE-287, T1557
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

3.3NIST NVDAV:A/AC:L/Au:N/C:P/I:N/A:N
4.3NIST NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

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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