CVE-2020-12126
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 · uneditedMultiple authentication bypass vulnerabilities in the /cgi-bin/ endpoint of the WAVLINK WN530H4 M30H4.V5030.190403 allow an attacker to leak router settings, change configuration variables, and cause denial of service via an unauthenticated endpoint.
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 confidenceMultiple authentication bypass vulnerabilities in the /cgi-bin/ endpoint of the WAVLINK WN530H4 router firmware allow unauthenticated attackers to leak router settings, modify configuration variables, and cause denial of service. The vulnerabilities stem from missing or insufficient authentication checks on specific CGI scripts.
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= m30h4.v5030.190403CVSS 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
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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 router modelLog into the router admin interface or check the device label to confirm the model is WN530H4Affected if The device is not a Wavlink WN530H4 router - different models are not affected by this CVE
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Check firmware versionNavigate to the router admin interface System Settings or Status page, or use the command 'cat /proc/version' or 'ver' via telnet/SSH if available, to identify the installed firmware versionAffected if The firmware version does not exactly match m30h4.v5030.190403 - only this specific version is listed as affected
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Verify /cgi-bin/ endpoint accessibilityAttempt to access the router over HTTP/HTTPS from the local network by visiting http://[router-ip]/cgi-bin/ or specific CGI scripts within this directory without providing any login credentialsAffected if The /cgi-bin/ endpoint or its scripts respond without requiring authentication - this indicates the authentication bypass is present
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Test for unauthenticated configuration accessSend a direct HTTP request to common CGI scripts (e.g., /cgi-bin/ login.cgi, /cgi-bin/ setcfg.cgi, or /cgi-bin/ getcfg.cgi) without any session cookies or authentication headersAffected if The CGI scripts return router configuration data, allow parameter modification, or execute actions without requiring authentication - confirming the vulnerability is exploitable
A user is affected if they have a Wavlink WN530H4 router running firmware version m30h4.v5030.190403 and the /cgi-bin/ endpoint responds to unauthenticated requests.
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 dataRestrict access to the router's admin interface from untrusted networks, disable remote management if not required, and apply vendor firmware updates when available. Consider network segmentation to limit exposure of affected devices.
- Consultation8.0 h
- Implementation4.0 h
- Testing6.0 h
- Review / QA4.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2020-12126 — 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-2020-12126 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
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