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Aterm Wg1900hp2 FirmwareOperating system · Nec

CVE-2021-20680

MEDIUM · 6.1 CVSS v3.1 Published 2021-04-26
Fix available
A fix is available. Upgrade to after 2.5.1 or later.
See remediation →
68/100
Remediation priority · Elevated
Remotely reachable No privileges

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
Cross-site scripting vulnerability in NEC Aterm devices (Aterm WG1900HP2 firmware Ver.1.3.1 and earlier, Aterm WG1900HP firmware Ver.2.5.1 and earlier, Aterm WG1800HP4 firmware Ver.1.3.1 and earlier, Aterm WG1800HP3 firmware Ver.1.5.1 and earlier, Aterm WG1200HS2 firmware Ver.2.5.0 and earlier, Aterm WG1200HP3 firmware Ver.1.3.1 and earlier, Aterm WG1200HP2 firmware Ver.2.5.0 and earlier, Aterm W1200EX firmware Ver.1.3.1 and earlier, Aterm W1200EX-MS firmware Ver.1.3.1 and earlier, Aterm WG1200HS firmware all versions Aterm WG1200HP firmware all versions Aterm WF800HP firmware all versions Aterm WF300HP2 firmware all versions Aterm WR8165N firmware all versions Aterm W500P firmware all versions, and Aterm W300P firmware all versions) allows remote attackers to inject arbitrary script or HTML 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

Cross-site scripting (XSS) vulnerability in the web management interface of NEC Aterm wireless router devices allows remote attackers to inject arbitrary JavaScript or HTML through unspecified input vectors. The vulnerability affects multiple Aterm models with firmware versions prior to updates, including both end-of-life and currently supported devices.

MitigationUpdate affected devices to the latest firmware versions provided by NEC. For devices without available firmware updates, restrict administrative access to the device's web interface to trusted networks or IP addresses only, and consider network segmentation.

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
Aterm Wg1900hp2 FirmwareOperating system
Affected:<= 1.3.1
Aterm Wg1900hp FirmwareOperating system
Affected:<= 2.5.1
Aterm Wg1800hp4 FirmwareOperating system
Affected:<= 1.3.1
Aterm Wg1800hp3 FirmwareOperating system
Affected:<= 1.5.1
Aterm Wg1200hs3 FirmwareOperating system
Affected:<= 1.1.2
Aterm Wg1200hs2 FirmwareOperating system
Affected:<= 2.5.0
Aterm Wg1200hp3 FirmwareOperating system
Affected:<= 1.3.1
Aterm Wg1200hp2 FirmwareOperating system
Affected:<= 2.5.0

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
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify your Aterm router model
    Locate the model number on the device label or log into the web management interface and check the status or device information page. Common model numbers include Wg1900hp2, Wg1900hp, Wg1800hp4, Wg1800hp3, Wg1200hs3, Wg1200hs2, Wg1200hp3, and Wg1200hp2.
    Affected if The model number matches one of the affected Aterm models listed in the CVE.
  2. Locate the firmware version in the web interface
    Access the router's web management interface (typically at 192.168.0.1 or 192.168.1.1), then navigate to the Status, System Information, or Maintenance section to find the installed firmware version.
    Affected if You cannot determine the firmware version because the web interface is inaccessible.
  3. Compare your firmware version to the affected ranges
    Match your model and firmware version against the following thresholds: Wg1900hp2 <= 1.3.1, Wg1900hp <= 2.5.1, Wg1800hp4 <= 1.3.1, Wg1800hp3 <= 1.5.1, Wg1200hs3 <= 1.1.2, Wg1200hs2 <= 2.5.0, Wg1200hp3 <= 1.3.1, Wg1200hp2 <= 2.5.0.
    Affected if Your firmware version is at or below the threshold for your specific model.
  4. Verify the web management interface is accessible
    Confirm that the router's web management interface is reachable on the network. The XSS vulnerability exists in this interface, so it must be accessible for exploitation.
    Affected if The web management interface is enabled and reachable from a network segment where untrusted users could interact with it.

You are affected if your Aterm model is one of the eight listed variants and your installed firmware version is at or below the version threshold for that model, with the web management interface accessible.

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
Upgrade available Upgrade to a release after 2.5.1
Interim mitigation

Update affected devices to the latest firmware versions provided by NEC. For devices without available firmware updates, restrict administrative access to the device's web interface to trusted networks or IP addresses only, and consider network segmentation.

Fix this in Aterm Wg1900hp2 Firmware Scoped from the published advisory
  • Consultation4.0 h
  • Implementation6.0 h
  • Testing3.0 h
  • Review / QA2.0 h
15.0 hours of engineering $2,690
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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-2021-20680 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