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Nport Iaw5150a 6i\/o FirmwareOperating system · Moxa

CVE-2021-32970

HIGH · 7.5 CVSS v3.1 Published 2022-04-01
Fix available
A fix is available. Upgrade to after 2.2 or later.
See remediation →
84/100
Remediation priority · High
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Data can be copied without validation in the built-in web server in Moxa NPort IAW5000A-I/O series firmware version 2.2 or earlier, which may allow a remote attacker to cause denial-of-service conditions.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

The built-in web server in Moxa NPort IAW5000A-I/O series devices (firmware 2.2 and earlier) contains a vulnerability where data is copied without validation, likely due to missing bounds checking in the HTTP request handling. This improper memory handling can be exploited by a remote attacker to trigger memory corruption, resulting in denial-of-service conditions.

MitigationUpgrade Moxa NPort IAW5000A-I/O series firmware to a version newer than 2.2. If firmware update is not immediately feasible, restrict network access to the device's web server interface using firewall rules or network segmentation.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Nport Iaw5150a 6i\/o FirmwareOperating system
Affected:<= 2.2
Nport Iaw5150a 12i\/o FirmwareOperating system
Affected:<= 2.2
Nport Iaw5250a 6i\/o FirmwareOperating system
Affected:<= 2.2
Nport Iaw5250a 12i\/o FirmwareOperating system
Affected:<= 2.2

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify the device model
    Access the device web interface or check the physical device label to confirm it is a Moxa NPort IAW5000A-I/O series model (IAW5150A or IAW5250A)
    Affected if The device is not an IAW5150A or IAW5250A model - these are the only affected models
  2. Check the firmware version
    Log into the device web interface and navigate to the System Settings or Device Information page to view the installed firmware version. Alternatively, use the device's administrative console or SNMP to query the firmware version.
    Affected if The firmware version is 2.2 or earlier - versions 2.2 and below are affected by this vulnerability
  3. Verify the built-in web server is enabled
    Access the device configuration and check the Network Settings or Services settings to confirm whether the HTTP/HTTPS web server interface is enabled and accessible on the network
    Affected if The web server is enabled and reachable - the vulnerability is exploitable through the built-in HTTP server
  4. Confirm network accessibility of the web interface
    Attempt to access the device web interface from your monitoring location using HTTP (port 80) or HTTPS (port 443) to verify it responds to requests
    Affected if The web interface is reachable over the network - remote exploitation requires network access to the HTTP service

You are affected if you have a Moxa NPort IAW5150A or IAW5250A device running firmware version 2.2 or earlier with the built-in web server enabled and accessible on the network.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to a release after 2.2
Interim mitigation

Upgrade Moxa NPort IAW5000A-I/O series firmware to a version newer than 2.2. If firmware update is not immediately feasible, restrict network access to the device's web server interface using firewall rules or network segmentation.

Recommended fix Moderate confidence

Latest available firmware version for NPort IAW5000A-I/O series (version newer than 2.2)

  1. 1. Download the latest firmware version for your specific NPort IAW5000A-I/O model from the official Moxa website (www.moxa.com)
  2. 2. Review the firmware release notes to confirm the version includes the security fix for CVE-2021-32970
  3. 3. Back up the current device configuration
  4. 4. Access the NPort device web interface or use Moxa's admin tools
  5. 5. Upload and install the new firmware version
  6. 6. After firmware update, verify the device is functioning properly and web server is operational
  7. 7. Confirm the installed firmware version is newer than 2.2
Caveat Minor: Review release notes for any configuration changes required after firmware update

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Nport Iaw5150a 6i\/o Firmware Scoped from the published advisory
  • Consultation4.0 h
  • Implementation3.0 h
  • Testing4.0 h
  • Review / QA2.0 h
13.0 hours of engineering $2,300
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2021-32970 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data