CVE intelligence and bounded remediation

CVE-2019-18252 — BIOTRONIK CardioMessenger II, The affected products allow credential reuse for multiple authentication purposes

Medium CVSS 4.3

BIOTRONIK CardioMessenger II, The affected products allow credential reuse for multiple authentication purposes. An attacker with adjacent access to the CardioMessenger can disclose its credentials used for connecting to the BIOTRONIK Remote Communication infrastructure.

Severity
Medium
CVSS
4.3 (3.1)
Published
2020-06-29
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-287

Affected products

  • biotronik / cardiomessenger_ii-s_gsm_firmware / 2.20
  • biotronik / cardiomessenger_ii-s_t-line_firmware / 2.20

Matched remediation archetype

Authentication bypass and missing authentication

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Check exposure

  • Map every affected endpoint and protocol path, including alternate ports, legacy routes, recovery flows, service accounts, and machine-to-machine access.
  • Confirm which deployments enable the affected authentication mode and whether the interface is reachable from untrusted networks.
  • Review session, token, credential, and proxy trust configuration without attempting account takeover.

Remediate safely

  • Apply the supported fix and centralize fail-closed authentication before protected request handling.
  • Remove default or embedded credentials, rotate affected secrets and sessions, and bind authentication decisions to the intended audience and channel.
  • Add negative tests for alternate routes, malformed or absent credentials, recovery flows, and proxy-derived identity.

Authoritative sources

Complete CVE record and remediation plan

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