CVE-2021-38456

highpriority · track · 39OT risk · elevatedEPSS 0.012 · 68 %ileEURUUS
grimoire priorityP2 · Scheduled
Exploitable?
—
no known exploitation
Likely / severe?
1.18% (68th) EPSS
CVSS 7.5 · high
Is it mine?
5 products
Check your exposure
Who says so?
5 sources
cnnvd · enisa_euvd · fstec_bdu · cisa_csaf_ot

EPSS · scored 2026-10-27

A use of hard-coded password vulnerability in the Moxa MXview Network Management software Versions 3.x to 3.2.2 may allow an attacker to gain access through accounts using default passwords

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

No vendor fix yet; a mitigation is available.

  • MitigationMXview Network Management Softwarecisa_csaf_ot

    If users need to use a multiple-site function, Moxa recommends a firewall to block Port 8883. If users do not have this requirement, Moxa suggests using the firewall to assign the Accessible IP of MXview at the client site.

02

cvss

Technical severity, 0–10. One row per scoring source.

9.8
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.5–9.8

v2.07.5highAV:N/AC:L/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 10 · impact 6.4
v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9
v3.09.8criticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · CISA US
v3.19.8criticalAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU
v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · ENISA EU
v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · ics-cert@hq.dhs.gov USexploitability 3.9 · impact 5.9
v3.19criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)
03

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-798USprimaryCWE-259USCWE-259USCWE-259US
04

affected products (5)

Products and version ranges known to be affected.

05

advisories (1)

Vendor and ecosystem advisories describing this.

  • ICSA-21-278-03Moxa MXview Network Management Software2021-10-05icsa · cisa_csaf_otUS

    Successful exploitation of these vulnerabilities may allow an attacker to create or overwrite critical files to execute code, gain access to the program, obtain credentials, disable the software, read and modify otherwise inaccessible data, allow remote connections to internal communication channels, or interact and use MQTT remotely.

06

also known as (5)

Other names and identifiers for this entity.

07

sources

Which sources assert this record, and when.

cnnvdenisa_euvdfstec_bducisa_csaf_otnvdNVDCVE.orgMITRE
published 2021-10-12modified 2026-06-17
09

references (6)

External citations — patches, advisories, analysis.

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