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P 660hwHardware / appliance · Zyxel

CVE-2008-1256

HIGH · 10.0 CVSS v2.0 Published 2008-03-10
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
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
The ZyXEL P-660HW series router has "admin" as its default password, which allows remote attackers to gain administrative 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 · high confidence

The ZyXEL P-660HW series router ships with a hardcoded default administrative password of 'admin', allowing remote unauthenticated attackers to gain full administrative access to the device through the web management interface.

MitigationImmediately change the default administrative password to a strong, unique password through the router's web interface, and disable remote administration if not required.

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
P 660hwHardware / appliance
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
Authentication
None
Confidentiality
Complete
Integrity
Complete
Availability
Complete

AV:N/AC:L/Au:N/C:C/I:C/A:C

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 ZyXEL P-660HW router on your network
    Check your network devices for the P-660HW model by accessing your network infrastructure documentation, DHCP leases, or by physically inspecting the device label on the router hardware
    Affected if You have a ZyXEL P-660HW series router in your environment
  2. Verify default credentials are still active
    Attempt to access the router's web management interface (typically at http://192.168.1.1 or the IP assigned to the WAN/ LAN interface) and log in using username 'admin' with password 'admin'
    Affected if The login succeeds with the default credential pair admin/admin
  3. Confirm remote administration is enabled
    Access the router's web interface and navigate to the Remote Management or Administration settings to verify if remote web access is allowed from the WAN side
    Affected if Remote administration from WAN is enabled, making the default password accessible from the internet

You are affected if you operate a ZyXEL P-660HW router with the default password 'admin' still configured, especially if remote administration is enabled on WAN.

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

Immediately change the default administrative password to a strong, unique password through the router's web interface, and disable remote administration if not required.

Fix this in P 660hw Scoped from the published advisory
  • Consultation1.0 h
  • Implementation1.0 h
  • Testing0.5 h
  • Review / QA0.5 h
3.0 hours of engineering $750
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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-2008-1256 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
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