CVE-2021-32968
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 · uneditedTwo buffer overflows 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 cause a denial-of-service condition.
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 confidenceBuffer overflow vulnerability in the built-in web server of Moxa NPort IAW5000A-I/O Series industrial wireless devices. The flaw allows remote attackers to send specially crafted HTTP requests that overflow buffers, leading to denial of service. The vulnerability affects firmware version 2.2 and earlier.
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<= 2.2<= 2.2<= 2.2<= 2.2CVSS 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 checksWork through these to decide whether this CVE applies to you.
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Identify the device modelLocate the model number on the device label or access the device's web interface to view system information. Confirm it is one of: Nport Iaw5150a 6i/o, Nport Iaw5150a 12i/o, Nport Iaw5250a 6i/o, or Nport Iaw5250a 12i/o.Affected if The device model matches one of the affected models listed above.
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Check the installed firmware versionAccess the device's web interface or use the management console to view the current firmware version. Compare this version number to the affected range of <= 2.2.Affected if The firmware version is 2.2 or earlier.
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Verify the built-in web server is enabledCheck the device configuration settings to confirm the HTTP web server interface is active. This is typically found in the network or services settings of the device management interface.Affected if The web server is enabled and accessible.
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Confirm network accessibility of the web serverDetermine if the device web server is reachable from network segments outside the local management VLAN. Check firewall rules, ACLs, or routing configuration that may permit external HTTP access to the device.Affected if The web server is exposed to untrusted network segments or the internet.
A user is affected if they have a Moxa NPort IAW5000A-I/O Series device (model IAW5150A or IAW5250A) running firmware version 2.2 or earlier with the built-in web server enabled and accessible from the network where the crafted HTTP requests could be received.
Generated from the published advisory. Verify against your own configuration.
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.
From vendor dataUpgrade Moxa NPort IAW5000A-I/O Series firmware to a version beyond 2.2. If patching is not immediately feasible, restrict network access to the device's web server interface using firewall rules or VLAN segmentation.
- Consultation4.0 h
- Implementation4.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-32968 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2021-32968 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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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.
- 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
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