CVE-2004-1684
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 · uneditedZyxel P681 running ZyNOS Vt020225a contains portions of memory in an ARP request, which allows remote attackers to obtain sensitive information by sniffing the network.
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 Zyxel P681 router running ZyNOS firmware Vt020225a improperly includes portions of system memory contents within ARP request packets. When an ARP request is broadcast on the network, it contains residual memory data which can be captured by attackers performing network sniffing, potentially exposing sensitive information such as configuration fragments, credentials, or other memory-resident data.
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= 681= vt020225aCVSS 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
- Authentication
- None
- Confidentiality
- Partial
- Integrity
- None
- Availability
- None
AV:N/AC:L/Au:N/C:P/I:N/A:N
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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Confirm router modelIdentify if the device is a Zyxel Prestige 681 router. This is typically visible on the device label or accessible via the router's web interface or console.Affected if The device is a Zyxel Prestige 681 router.
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Identify firmware versionAccess the router's administration interface or use the command line interface to retrieve the ZyNOS firmware version. Look for version string 'vt020225a'.Affected if The router is running ZyNOS firmware version vt020225a.
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Capture and inspect ARP trafficUse a network packet capture tool (such as Wireshark or tcpdump) on the same network segment to capture ARP request packets broadcast by the router. Inspect the packet contents beyond the expected ARP fields for any residual data fragments.Affected if ARP packets contain unexpected data portions that appear to be memory contents rather than proper ARP protocol fields.
The environment is affected if the device is a Zyxel Prestige 681 running ZyNOS firmware vt020225a AND captured ARP packets contain extraneous memory data.
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 dataUpdate the router firmware to a patched version if available; otherwise, network segment the device or replace the end-of-life hardware to prevent unauthorized ARP packet capture.
- Consultation2.0 h
- Implementation3.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2004-1684 — 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-2004-1684 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
- No spam, self-promotion, credentials, or personal data