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CVE Record

CVE-2020-27184: The NPort IA5000A Series devices use Telnet as one of the network device management services.

The NPort IA5000A Series devices use Telnet as one of the network device management services. Telnet does not support the encryption of client-server communications, making it vulnerable to Man-in-the-Middle attacks.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This issue is about unsafe remote management, not a software crash. NPort IA5000A devices can be managed over Telnet, which sends traffic without encryption. Anyone positioned between an administrator and the device could observe or tamper with management communications. Business risk depends heavily on whether Telnet is enabled and reachable.

Executive priority

Treat this as a configuration and network-exposure risk. Prioritize sites where these serial device servers support operational systems and where Telnet management is reachable beyond a tightly controlled admin network.

Technical view

CVE-2020-27184 affects NPort IA5000A Series devices with Telnet enabled, listed as all versions. The weakness is Telnet’s lack of encrypted client-server communication, creating man-in-the-middle exposure for device management sessions. The provided sources do not include CVSS, CWE, patch details, or confirmed exploitation.

Likely exposure

Exposure is likely limited to environments where NPort IA5000A management interfaces have Telnet enabled. Risk rises if management traffic crosses shared, wireless, remote-access, third-party, or otherwise untrusted networks. Internet-facing Telnet management would materially increase concern, but the source bundle does not state prevalence.

Exploitation context

The source bundle supports man-in-the-middle risk from unencrypted Telnet management traffic. It does not provide evidence of public exploitation, weaponized tooling, or CISA KEV listing. Exploitation would require network positioning between the administrator and device or access to the same management path.

Researcher notes

Evidence is narrow: the bundle identifies unencrypted Telnet management on NPort IA5000A Series devices with Telnet enabled, all versions. No CVSS vector, CWE, firmware fix, or exploit evidence is provided. Validation should focus on configuration state and management-plane reachability.

Mitigation direction

  • Review the Moxa advisory for supported remediation guidance.
  • Disable Telnet if supported by the device and operations model.
  • Use encrypted management access where vendor-supported.
  • Restrict management interfaces to trusted administration networks.
  • Monitor for unexpected Telnet access to affected devices.

Validation and detection

  • Inventory NPort IA5000A devices in OT and network environments.
  • Confirm whether Telnet management is enabled on each device.
  • Check whether Telnet is reachable from untrusted networks.
  • Review firewall and segmentation controls around management access.
  • Verify remediation against the vendor advisory before production rollout.
Prepared
Confidence
medium
Sources
4

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

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2020-27184 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
3Source 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/aNPort IA5000A Series with Telnet enabledAll versionsListed
Weakness

CWE details

No CWE listed

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