CVE-2020-12127
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 · uneditedAn information disclosure vulnerability in the /cgi-bin/ExportAllSettings.sh endpoint of the WAVLINK WN530H4 M30H4.V5030.190403 allows an attacker to leak router settings, including cleartext login details, DNS settings, and other sensitive information without authentication.
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 confidenceThe WAVLINK WN530H4 router contains an unauthenticated information disclosure vulnerability in the /cgi-bin/ExportAllSettings.sh endpoint. This CGI script exports the full router configuration including cleartext login credentials, DNS server settings, and other sensitive system parameters without requiring any authentication, allowing remote attackers to retrieve all configuration data by directly accessing this endpoint.
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
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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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Identify the router modelAccess the router admin interface or check the device label to confirm the model is Wavlink WN530H4Affected if The device is not a WN530H4 model - different models are not affected by this specific CVE
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Check the firmware versionLog into the router admin panel and look in System Settings or Administration > Firmware Upgrade for the version string m30h4.v5030.190403Affected if The installed firmware is exactly version m30h4.v5030.190403 - other versions may have different vulnerability status
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Test for unauthenticated endpoint accessFrom a browser or curl command, navigate to http://<router-ip>/cgi-bin/ExportAllSettings.sh without providing any login credentialsAffected if The page loads and displays router configuration content (including plain text usernames and passwords) without requiring authentication - this confirms exploitation
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Verify the exposed data contains credentialsExamine the response from step 3 for plain text login credentials, DNS server settings, or other sensitive system parametersAffected if The exported configuration contains cleartext administrative credentials or other sensitive data - this confirms the vulnerability is present
You are affected if you have a Wavlink WN530H4 router running firmware version m30h4.v5030.190403 and the /cgi-bin/ExportAllSettings.sh endpoint is accessible without authentication, returning sensitive configuration 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 dataApply available firmware updates from WAVLINK. If no update exists, disable remote administration, block external access to the /cgi-bin/ directory via firewall rules, and monitor for unauthorized access attempts.
- Consultation2.0 h
- Implementation1.0 h
- Testing2.0 h
- Review / QA1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2020-12127 — 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-2020-12127 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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