CVE-2026-7241
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 vulnerability was found in Totolink A8000RU 7.1cu.643_b20200521. This issue affects the function setWiFiBasicCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Performing a manipulation of the argument wifiOff results in os command injection. The attack is possible to be carried out remotely. The exploit has been made public and could be used.
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 A8000RU router's CGI handler (cstecgi.cgi). The setWiFiBasicCfg function fails to sanitize the wifiOff parameter, allowing remote attackers to inject and execute arbitrary OS commands on the device. The CVSS 9.8 indicates trivial exploitability with no authentication required.
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 admin interface or check the device label/marketing materials for the exact model number. Look for 'A8000RU' in Totolink branding.Affected if The device is NOT a Totolink A8000RU router - if it is a different model, this specific CVE does not apply.
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Locate the CGI handlerAttempt to access the CGI endpoint at /cgi-bin/cstecgi.cgi on the router's web server. This is the vulnerable component.Affected if The file cstecgi.cgi does not exist or is not present on the device - the vulnerability cannot be exploited.
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Verify remote web management is enabledCheck router administration settings for 'Remote Management', 'Remote Access', or 'Web Management' options. Confirm if the web interface is accessible from WAN/outside networks.Affected if Remote web management is ENABLED - the CGI handler is exposed to external networks, making exploitation possible without network segmentation.
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Check the setWiFiBasicCfg function exposureAttempt a test request to cstecgi.cgi invoking the setWiFiBasicCfg function, or inspect the binary/lua scripts for this function name.Affected if The setWiFiBasicCfg function is present and handles the wifiOff parameter without input validation - the injection point exists.
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Confirm network exposureScan the router's public IP or WAN interface to verify port 80/443 is accessible from the internet. Use external scanning tools or check router WAN status.Affected if The router's HTTP/HTTPS ports are exposed to the internet - combined with the vulnerable CGI, this enables remote unauthenticated exploitation.
You are affected if you own a Totolink A8000RU router with its web interface (cstecgi.cgi) accessible remotely, as the unauthenticated command injection in the setWiFiBasicCfg function's wifiOff parameter becomes exploitable over the network.
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; otherwise disable remote web management access, segment device to limited management network, or replace the device if no patch exists. The public exploit availability necessitates urgent remediation.
- Consultation3.0 h
- Implementation4.0 h
- Testing2.0 h
- Review / QA1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-7241 — 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-2026-7241 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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- Version or environment caveats, and links to real fixes
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