CVE-2021-4479Network attack vector

Service interruption via malformed Medibus data

Published Jun 2, 2026 · Updated Jun 2, 2026

Improper input validation in Dräger Atlan A350 1.00 through 1.01 allows attackers to interrupt service via the Medibus interface. The interface handles specifically crafted non-Medibus-compliant data incorrectly, causing the internal processor to become overloaded gradually over several hours. Exposure requires direct RS-232 access or an environment that routes the serial link over Ethernet, and the interruption stops connected-device data transmission and delays or distorts displayed curves.

CVSS severity6.3
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Dräger Atlan A350 1.00 through 1.01 allows attackers to interrupt service via the Medibus interface. The interface handles specifically crafted non-Medibus-compliant data incorrectly, causing the internal processor to become overloaded gradually over several hours. Exposure requires direct RS-232 access or an environment that routes the serial link over Ethernet, and the interruption stops connected-device data transmission and delays or distorts displayed curves.

The record

CVE
CVE-2021-4479
Published
Jun 2, 2026
Updated
Jun 2, 2026
Vendor
Dräger
Product
Atlan A350
Classifications
CWE-1286, CWE-20, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 2, 2026Record 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=1.00 <7.5.3
  2. Affected versionversion=1.01

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Dräger · Atlan A350version=1.00 <7.5.3; version=1.01

Published CVSS scores

3.2DrägerCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:L
4.0VulnCheckCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:L
4.0DrägerCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:L
6.3VulnCheckCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L

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 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-1286Improper Validation of Syntactic Correctness of Input
CWE-20Improper Input Validation
T1499.004Application or System Exploitation

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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