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CVE Record

CVE-2021-37166: A buffer overflow issue leading to denial of service was discovered in HMI3 Control Panel in Swisslog Healt...

A buffer overflow issue leading to denial of service was discovered in HMI3 Control Panel in Swisslog Healthcare Nexus Panel operated by released versions of software before Nexus Software 7.2.5.7. When HMI3 starts up, it binds a local service to a TCP port on all interfaces of the device, and takes extensive time for the GUI to connect to the TCP socket, allowing the connection to be hijacked by an external attacker.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-37166 affects Swisslog Healthcare Nexus Panel systems running Nexus Software before 7.2.5.7. During HMI3 startup, a local GUI service listens on all device interfaces long enough that an external attacker could take over the connection path and cause denial of service.

Executive priority

Treat this as an operational resilience issue for affected healthcare automation systems. Prioritize sites where Nexus Panel devices are reachable beyond tightly controlled networks or where service interruption would affect clinical logistics.

Technical view

The source describes a buffer overflow denial-of-service issue in HMI3 Control Panel. The risky condition is a TCP service bound to all interfaces during startup while the legitimate GUI is delayed connecting, enabling external connection hijacking. No CVSS, CWE, or detailed exploit prerequisites are provided.

Likely exposure

Exposure is most likely in healthcare environments using Swisslog Healthcare Nexus Panel with HMI3 Control Panel on Nexus Software versions before 7.2.5.7, especially where device interfaces are reachable from untrusted or broad internal networks.

Exploitation context

The bundle does not show CISA KEV listing or confirmed active exploitation. Public discussion is associated with Armis PwnedPiper and Swisslog disclosures, but the provided evidence supports denial-of-service risk, not proven exploitation in the wild.

Researcher notes

Key gaps remain: no CVSS vector, CWE mapping, affected CPEs, or detailed vendor mitigation text are included in the bundle. Analysis should stay anchored to the pre-7.2.5.7 version boundary and denial-of-service impact.

Mitigation direction

  • Upgrade affected Nexus Software to 7.2.5.7 or later where applicable.
  • Review Swisslog Healthcare’s bulletin for product-specific remediation instructions.
  • Restrict network reachability to Nexus Panel and HMI3 interfaces.
  • Segment Swisslog Healthcare devices from general user and guest networks.
  • Monitor for unexpected connections to HMI3-related services during startup.

Validation and detection

  • Inventory Swisslog Healthcare Nexus Panel deployments and HMI3 Control Panel usage.
  • Confirm each device’s Nexus Software version against the before-7.2.5.7 affected range.
  • Review firewall rules and network paths reaching device management or GUI services.
  • Check vendor maintenance records for applied Swisslog remediation.
  • Validate operational monitoring covers device startup failures or GUI denial-of-service symptoms.
Prepared
Confidence
medium
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2021-37166 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
5Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.