CVE-2021-43935Network attack vector

Unauthenticated account access via passwordless SSO entry

Published Dec 15, 2021 · Updated Sep 16, 2024

Authentication bypass in affected Welch Allyn cardiology products allows remote attackers to access provisioned AD accounts without passwords. The SSO login path accepts a manually entered account name and creates an application session without validating that account's password. The flaw is reachable only when Active Directory authentication and SSO are enabled, and the session receives every application privilege assigned to the selected account.

CVSS severity8.1
High
EPSS probability1.08%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in affected Welch Allyn cardiology products allows remote attackers to access provisioned AD accounts without passwords. The SSO login path accepts a manually entered account name and creates an application session without validating that account's password. The flaw is reachable only when Active Directory authentication and SSO are enabled, and the session receives every application privilege assigned to the selected account.

The record

CVE
CVE-2021-43935
Published
Dec 15, 2021
Updated
Sep 16, 2024
Vendor
Baxter International
Product
Welch Allyn H-Scribe Holter Analysis System
Classifications
CWE-287, CWE-288, T1078.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 15, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=5.01 <=6.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Baxter International · Welch Allyn H-Scribe Holter Analysis Systemversion=5.01 <=6.4.0
Baxter International · Welch Allyn R-Scribe Resting ECG Systemversion=5.01 <=7.0.0
Baxter International · Welch Allyn X-Scribe Cardiac Stress Testing Systemversion=5.01 <=6.3.1
Baxter International · Welch Allyn Q-Stress Cardiac Stress Testing Systemversion=6.0.0 <=6.3.1
Baxter International · Welch Allyn Diagnostic Cardiology Suite ECGversion=1.0.0 <=1.1.1; version=2.1.0
Baxter International · Welch Allyn Vision Express Holter Analysis Systemversion=6.1.0 <=6.4.0

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.1ICS-CERTCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
CWE-288Authentication Bypass Using an Alternate Path or Channel
T1078.002Valid Accounts: Domain Accounts

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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