CVE-2016-4500
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 · uneditedMoxa UC-7408 LX-Plus devices allow remote authenticated users to write to the firmware, and consequently render a device unusable, by leveraging root access.
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 confidenceThe Moxa UC-7408 LX-Plus embedded device has a firmware write vulnerability where remote authenticated users with root privileges can write to the firmware image. This allows an attacker to overwrite firmware, potentially rendering the device unusable or introducing malicious code.
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 dataall versionsall versionsCVSS 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
- High
- Privileges
- High
- User interaction
- None
- Scope
- Changed
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:C/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 modelCheck the device label, boot console, or web management interface for the exact model number. Look for 'UC-7408 LX-Plus' marking on the hardware or in the system information page.Affected if The device is not a Moxa UC-7408 LX-Plus, then it is not affected by this specific CVE.
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Confirm firmware versionAccess the device's web interface or console and locate the firmware version information, typically found under 'System Information' or 'Device Status' pages.Affected if Any firmware version on a UC-7408 LX-Plus is affected since all versions are vulnerable.
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Check remote management interface exposureDetermine if the device's web-based management interface (HTTP/HTTPS) is accessible from untrusted networks by reviewing network firewall rules, port scans from external IPs, or device network configuration.Affected if The management interface is exposed to untrusted networks, increasing the likelihood of exploitation.
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Verify root access authentication settingsReview the device's user authentication configuration to determine if remote root-level login is enabled and what authentication methods are permitted (SSH, web, telnet).Affected if Remote root-level authentication is enabled, which is required for exploitation of this vulnerability.
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Assess network accessibility of firmware update featureIdentify whether the firmware update functionality is accessible remotely and review any IP-based access restrictions on the device's administration interface.Affected if The firmware update mechanism can be reached remotely without network-level restrictions.
The environment is affected if the device is a Moxa UC-7408 LX-Plus with its management interfaces and root access exposed to untrusted networks, allowing remote authenticated attackers to write firmware images.
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 dataRestrict root access permissions and implement firmware integrity verification; consider network segmentation to limit exposure of management interfaces to untrusted networks.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,600.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2016-4500 — 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-2016-4500 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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