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Nport Iaw5150a 6i\/o FirmwareOperating system · Moxa

CVE-2021-32974

CRITICAL · 9.8 CVSS v3.1 Published 2022-04-01
Fix available
A fix is available. Upgrade to after 2.2 or later.
See remediation →
100/100
Remediation priority · Urgent
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
Improper input validation in the built-in web server in Moxa NPort IAW5000A-I/O series firmware version 2.2 or earlier may allow a remote attacker to execute commands.

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

Improper input validation in the built-in web server of Moxa NPort IAW5000A-I/O series devices (firmware 2.2 and earlier) allows remote attackers to execute arbitrary commands. This is a critical remote code execution (RCE) vulnerability accessible over the network with no authentication required, as indicated by the CVSS 9.8 score.

MitigationUpgrade Moxa NPort IAW5000A-I/O firmware to a version newer than 2.2; if patching 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
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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 device label/console to confirm the exact model number is Moxa NPort IAW5150A or IAW5250A (6i/o or 12i/o variant).
    Affected if The device is a Moxa NPort IAW5150A or IAW5250A series unit.
  2. Determine 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, or use the device console/CLI to query the firmware version.
    Affected if The firmware version is 2.2 or earlier.
  3. Verify the built-in web server is enabled
    Check the device web server configuration settings (typically under Network Settings or Web Server Settings) to confirm the HTTP/HTTPS web interface is enabled and running.
    Affected if The built-in web server is enabled and operational on the device.
  4. Confirm network accessibility of the web interface
    Attempt to access the device web interface from a network location using a browser (for example, http://<device_ip>) or use a port scan to verify port 80 or 443 is listening and reachable.
    Affected if The device web interface is reachable over the network from untrusted segments.

If the device is a Moxa NPort IAW5150A or IAW5250A series with firmware version 2.2 or earlier and the built-in web server is enabled and network-accessible, the environment is affected by CVE-2021-32974.

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 firmware to a version newer than 2.2; if patching is not immediately feasible, restrict network access to the device's web server interface using firewall rules or network segmentation.

Recommended fix Low confidence

Firmware version greater than 2.2 (contact Moxa for exact fixed release)

  1. Identify the current firmware version of the Moxa NPort IAW5000A series device by accessing the web interface or using the device's management console
  2. Download the latest firmware version from the official Moxa support website (www.moxa.com) for your specific model (IAW5150a or IAW5250a)
  3. Before upgrading, backup the current device configuration to ensure you can restore settings if needed
  4. Access the device's web-based management interface and navigate to the firmware upgrade section
  5. Upload and install the new firmware version, ensuring stable power during the process
  6. After the firmware upgrade completes, verify the device is operational and the web server is functioning normally
  7. Confirm the new firmware version is installed and matches the version obtained from Moxa
Caveat Review Moxa release notes for any configuration or functionality changes between your current version and the new version

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
  • Implementation2.0 h
  • Testing3.0 h
  • Review / QA2.0 h
11.0 hours of engineering $1,970
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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-2021-32974 in production — separate from our analysis above.

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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