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Etx R FirmwareOperating system · Iodata

CVE-2016-4821

MEDIUM · 5.3 CVSS v3.0 Published 2016-06-19
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
62/100
Remediation priority · Elevated
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
I-O DATA DEVICE ETX-R devices allow remote attackers to cause a denial of service (web-server crash) via unspecified vectors.

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

I-O DATA DEVICE ETX-R devices contain a vulnerability in their embedded web server component that allows remote attackers to cause a denial of service via unspecified vectors, resulting in a web-server crash. The attack is network-based and does not require authentication.

MitigationIsolate affected devices behind firewalls or restrict network access, contact I-O DATA for firmware updates, and implement network segmentation to limit exposure to untrusted networks.

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
Etx R FirmwareOperating system
Affected:all versions

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
Low

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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. Confirm device model is ETX-R
    Inspect the physical device label or log into the web interface to verify the model number displays as I-O DATA ETX-R or I-O DATA DEVICE ETX-R
    Affected if The device is any I-O DATA ETX-R model
  2. Verify embedded web server is running
    Attempt to access the device web interface via HTTP/HTTPS on the configured IP address or hostname. Check if the login page or any web content loads.
    Affected if The web server responds to HTTP/HTTPS requests (indicating the service is running and potentially exploitable)
  3. Check web server status
    Review current web server availability - if requests timeout, return errors, or the page fails to load when it previously worked, the web server may have crashed from this vulnerability
    Affected if The web interface is inaccessible or returns error responses indicating the web server has crashed

You are affected if you have an I-O DATA ETX-R device with its embedded web server accessible on the network, as all firmware versions contain this vulnerability.

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.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Isolate affected devices behind firewalls or restrict network access, contact I-O DATA for firmware updates, and implement network segmentation to limit exposure to untrusted networks.

Fix this in Etx R Firmware Scoped from the published advisory
  • Consultation2.0 h
  • Implementation3.0 h
  • Testing2.0 h
  • Review / QA1.0 h
8.0 hours of engineering $1,420
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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-2016-4821 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