CVE-2020-27185Network attack vector

Sensitive-data interception via cleartext management traffic

Published May 14, 2021 · Updated Aug 4, 2024

Cleartext transmission in all Moxa NPort IA5000A Series versions allows man-in-the-middle attackers to read sensitive Moxa Service traffic. Moxa Service sends authentication data, device configuration, firmware version, and other traffic without transport protection on UDP 4800 or TCP 4900. Exploitation requires network position to intercept a session initiated through DSU or NPort Search Utility while Moxa Service is enabled.

CVSS severity7.5
High
EPSS probability0.73%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cleartext transmission in all Moxa NPort IA5000A Series versions allows man-in-the-middle attackers to read sensitive Moxa Service traffic. Moxa Service sends authentication data, device configuration, firmware version, and other traffic without transport protection on UDP 4800 or TCP 4900. Exploitation requires network position to intercept a session initiated through DSU or NPort Search Utility while Moxa Service is enabled.

The record

CVE
CVE-2020-27185
Published
May 14, 2021
Updated
Aug 4, 2024
Vendor
Moxa
Product
NPort IA5000A Series
Classifications
CWE-319, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 14, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=All versions

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Moxa · NPort IA5000A Seriesversion=All versions

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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-319Cleartext Transmission of Sensitive Information
T1557Adversary-in-the-Middle

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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