CVE-2026-6027
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 · uneditedA weakness has been identified in Totolink A7100RU 7.4cu.2313_b20191024. This issue affects the function setUrlFilterRules of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Executing a manipulation of the argument enable can lead to os command injection. The attack can be launched remotely. The exploit has been made available to the public and could be used for attacks.
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 confidenceOS command injection vulnerability in Totolink A7100RU router's CGI handler. The setUrlFilterRules function in /cgi-bin/cstecgi.cgi fails to sanitize the 'enable' argument, allowing remote attackers to execute arbitrary OS commands via the web interface.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
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
- 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 the device modelAccess the router's web interface or check the device label/marketing materials for the exact model number A7100RUAffected if The device is not a Totolink A7100RU router - this vulnerability only affects that specific model
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Verify the CGI endpoint existsAttempt to access http://<router-ip>/cgi-bin/cstecgi.cgi - check if the endpoint respondsAffected if The CGI endpoint returns a 404 or is unreachable - the vulnerable handler is not present
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Confirm the web management interface is enabledCheck router admin panel or network access settings to verify the HTTP/HTTPS web management interface is active and accessible from your network positionAffected if Web management is disabled - the attack surface is not exposed
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Check if URL filter functionality is accessibleNavigate to the URL filter or content filtering settings in the router's web admin panel - look for any enable option or rules configuration related to URL filteringAffected if The setUrlFilterRules function is not reachable or the URL filter feature is not present in the firmware
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Identify the installed firmware versionIn the router web interface, locate the firmware version information (usually in Status, System, or Maintenance section) and compare to any available patched versions from TotolinkAffected if The firmware version matches the affected range and the above conditions are met
You are affected if you have a Totolink A7100RU router with an accessible web interface where the CGI handler and URL filter feature are both enabled, allowing the 'enable' parameter in setUrlFilterRules to be manipulated.
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 vendor firmware patch if available. If no patch exists, disable the web management interface or restrict access to trusted IPs only. Consider device replacement if end-of-life.
- Consultation4.0 h
- Implementation2.0 h
- Testing3.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-6027 — 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-2026-6027 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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