CVE-2019-9103Network attack vector

Unauthenticated username disclosure via missing authorization

Published Mar 11, 2020 · Updated Aug 4, 2024

Information exposure in Moxa MGate MB3xxx firmware allows remote attackers to obtain usernames through the built-in web service. The service fails to require authorization before returning sensitive information; Moxa has not disclosed the request handler, endpoint, or response fields. Network access is sufficient on MB3170 and MB3270 4.0 and earlier, MB3280 and MB3480 3.0 and earlier, MB3660 2.2 and earlier, and MB3180 2.0 and earlier; the documented consequence is disclosure, including usernames.

CVSS severity5.3
Medium
EPSS probability1.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information exposure in Moxa MGate MB3xxx firmware allows remote attackers to obtain usernames through the built-in web service. The service fails to require authorization before returning sensitive information; Moxa has not disclosed the request handler, endpoint, or response fields. Network access is sufficient on MB3170 and MB3270 4.0 and earlier, MB3280 and MB3480 3.0 and earlier, MB3660 2.2 and earlier, and MB3180 2.0 and earlier; the documented consequence is disclosure, including usernames.

The record

CVE
CVE-2019-9103
Published
Mar 11, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-200, T1087
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 11, 2020CVE 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

5.3MITRECVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:P/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1087Account Discovery

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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