CVE-2026-9478
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 A8000RU 7.1cu.643_b20200521. Impacted is the function setParentalRules of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. Executing a manipulation of the argument enable can lead to os command injection. The attack may be performed from remote. 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 confidenceThe Totolink A8000RU router firmware 7.1cu.643_b20200521 contains an OS command injection vulnerability in the web management interface CGI binary (/cgi-bin/cstecgi.cgi). The setParentalRules function improperly sanitizes the 'enable' parameter before passing it to system() or similar exec calls, allowing remote attackers to execute arbitrary operating system commands with root privileges.
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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Confirm device model is Totolink A8000RUAccess the router web interface or check device label/marketing materials for model number A8000RUAffected if Device is not a Totolink A8000RU router, then this specific CVE does not apply
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Check installed firmware versionLog into the router web management interface and locate the firmware version information, typically found under System, Status, or Firmware Upgrade sections. Compare the version number to v7.1cu.643_b20200521Affected if Firmware version matches or is older than v7.1cu.643_b20200521 (the vulnerable version)
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Verify the vulnerable CGI script existsAttempt to access the URI /cgi-bin/cstecbi.cgi on the router (e.g., http://<router-ip>/cgi-bin/cstecbi.cgi). A 200 response or the presence of the file indicates the endpoint existsAffected if The /cgi-bin/cstecbi.cgi endpoint is present and accessible on the device
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Confirm web management interface is network-accessibleDetermine if the router web interface is reachable from network segments beyond the trusted local network, or if remote administration is enabled. Check router settings for 'Remote Management', 'Remote Access', or 'Web Management' configurationAffected if The web management interface is exposed to untrusted networks or remote administration is enabled, making the command injection exploitable remotely
If the device is a Totolink A8000RU running firmware version v7.1cu.643_b20200521 or earlier, the /cgi-bin/cstecbi.cgi endpoint is present, and the web management interface is accessible (especially from untrusted networks), then the environment is affected by CVE-2026-9478.
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 the vendor firmware patch when available; as an interim control, disable remote web management access or place the device behind a firewall restricting HTTP/HTTPS management access to trusted IP ranges only.
- Consultation4.0 h
- Implementation2.0 h
- Testing6.0 h
- Review / QA3.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-9478 — 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-2026-9478 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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