HOMEVULNERABILITIESCVE-2021-37166
HIGH

CVE-2021-37166

CWE-120Published: August 2, 2021· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2021-37166 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

swisslog-healthcare2 product(s)
hmi-3 control panel firmwarehmi-3 control panel
Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://www.swisslog-healthcare.com/-/media/swisslog-healthcare/documents/customer-service/armis-documents/cve-2021-37166-bulletin---gui-socket-denial-of-service.pdf?rev=05321b2af1064eb2a6d6e6bf77604c6b&hash=40A927FE1153AA980428C93B2EF7EB40
ADVISORYhttps://www.swisslog-healthcare.com/-/media/swisslog-healthcare/documents/customer-service/armis-documents/cve-2021-37166-bulletin---gui-socket-denial-of-service.pdf?rev=05321b2af1064eb2a6d6e6bf77604c6b&hash=40A927FE1153AA980428C93B2EF7EB40

All References (8)

→
https://www.armis.com/PwnedPiperBroken Link
→
https://www.swisslog-healthcare.comProduct
→
https://www.swisslog-healthcare.com/-/media/swisslog-healthcare/documents/customer-service/armis-documents/cve-2021-37166-bulletin---gui-socket-denial-of-service.pdf?rev=05321b2af1064eb2a6d6e6bf77604c6b&hash=40A927FE1153AA980428C93B2EF7EB40Vendor Advisory
→
https://www.swisslog-healthcare.com/en-us/customer-care/security-information/cve-disclosures#:~:text=CVE%20Disclosures%20%20%20%20Vulnerability%20Name%20%2C%20%20CVE-2021-37164%20%204%20more%20rows%20
→
https://www.armis.com/PwnedPiperBroken Link
→
https://www.swisslog-healthcare.comProduct
→
https://www.swisslog-healthcare.com/-/media/swisslog-healthcare/documents/customer-service/armis-documents/cve-2021-37166-bulletin---gui-socket-denial-of-service.pdf?rev=05321b2af1064eb2a6d6e6bf77604c6b&hash=40A927FE1153AA980428C93B2EF7EB40Vendor Advisory
→
https://www.swisslog-healthcare.com/en-us/customer-care/security-information/cve-disclosures#:~:text=CVE%20Disclosures%20%20%20%20Vulnerability%20Name%20%2C%20%20CVE-2021-37164%20%204%20more%20rows%20

Quick Facts

CVE IDCVE-2021-37166
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-120
CISA KEVNo
Affected1 vendor(s)
PublishedAug 2, 2021

Related CVEs (CWE-120)

CVE-2017-16740
10.0
CVE-2021-33975
10.0
CVE-1999-1237
10.0
CVE-2012-10035
10.0
CVE-2021-33972
10.0
CVE-2023-4260
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-37166 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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