CVE intelligence and bounded remediation

CVE-2021-43935 — The impacted products, when configured to use SSO, are affected by an improper authentication vulnerability

Critical CVSS 9.8

The impacted products, when configured to use SSO, are affected by an improper authentication vulnerability. This vulnerability allows the application to accept manual entry of any active directory (AD) account provisioned in the application without supplying a password, resulting in access to the application as the supplied AD account, with all associated privileges.

Severity
Critical
CVSS
9.8 (3.1)
Published
2021-12-15
CISA KEV
Not currently listed
Ecosystem
software/application
Weaknesses
CWE-288, CWE-287

Affected products

  • baxter / welch_allyn_connex_cardio
  • baxter / welch_allyn_diagnostic_cardiology_suite / 2.1.0
  • baxter / welch_allyn_rscribe_resting_ecg_system
  • baxter / welch_allyn_vision_express_holter_analysis_system
  • baxter / welch_allyn_hscribe_holter_analysis_system_firmware
  • baxter / welch_allyn_q-stress_cardiac_stress_testing_system_firmware

Showing 6 representative product identities from 7 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

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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