CVE-2020-5606
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 · uneditedCross-site scripting vulnerability in WHR-G54S firmware 1.43 and earlier allows remote attackers to inject arbitrary script via a specially crafted page.
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 confidenceCross-site scripting (XSS) vulnerability in Buffalo WHR-G54S router firmware version 1.43 and earlier allows remote attackers to inject arbitrary JavaScript or HTML into web pages served by the device. This occurs due to insufficient input validation on web interface parameters, enabling malicious script execution in the context of the router's management pages.
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<= 1.43CVSS 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 checksWork through these to decide whether this CVE applies to you.
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Identify the device modelAccess the router's web interface or check the physical device label to confirm it is a Buffalo WHR-G54S modelAffected if The device is a Buffalo WHR-G54S unit
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Determine the installed firmware versionLog into the router's web management interface and navigate to the Administration or System section to view the firmware version, or use the router's administrative CLI if availableAffected if The firmware version displayed is 1.43 or any version number lower than 1.43
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Compare your version against the affected rangeDocument the exact firmware version string shown in the router's admin interface and compare it to the affected range of version 1.43 and earlierAffected if The installed firmware version is 1.43 or earlier
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Assess web interface exposureDetermine if the router's web management interface is accessible from the network by attempting to access the router's IP address on ports 80 or 443 from an external location, or review firewall rulesAffected if The web interface is exposed to untrusted networks or the internet
You are affected if you are running a Buffalo WHR-G54S router with firmware version 1.43 or earlier and the router's web interface is accessible.
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 dataApply available firmware update from Buffalo to address the XSS vulnerability. If no patch is available, implement network segmentation to limit exposure to untrusted users and consider replacing the end-of-life device.
- Consultation2.0 h
- Implementation2.0 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-2020-5606 — 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-2020-5606 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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- 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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