CVE-2021-37166Network attack vector

Service interruption via startup socket hijacking

Published Aug 2, 2021 · Updated Aug 4, 2024

Denial of service in Swisslog Healthcare HMI3 Control Panel before 7.2.5.7 allows remote attackers to interrupt the GUI service. At startup, HMI3 binds a local TCP service on every network interface and delays the GUI connection, allowing remote attackers to claim the socket first. The attack requires Ethernet connectivity and a restart-time race; a successful socket hijack prevents the GUI from connecting.

CVSS severity7.5
High
EPSS probability2.06%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Swisslog Healthcare HMI3 Control Panel before 7.2.5.7 allows remote attackers to interrupt the GUI service. At startup, HMI3 binds a local TCP service on every network interface and delays the GUI connection, allowing remote attackers to claim the socket first. The attack requires Ethernet connectivity and a restart-time race; a successful socket hijack prevents the GUI from connecting.

The record

CVE
CVE-2021-37166
Published
Aug 2, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 2, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8NIST National Vulnerability DatabaseAV:N/AC:L/Au:N/C:N/I:N/A:C
7.5NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499Endpoint Denial of Service

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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