CVE-2026-9476
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 identified in Totolink A8000RU 7.1cu.643_b20200521. This vulnerability affects the function setPasswordCfg of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. Such manipulation of the argument admpass leads to os command injection. The attack can be executed remotely. The exploit is publicly available and might 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 web management interface. The setPasswordCfg function in /cgi-bin/cstecgi.cgi fails to sanitize the admpass parameter before passing it to system() calls, allowing remote attackers to inject and execute arbitrary operating system commands.
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 device modelAccess the router's admin interface or check the device label/marketing materials to confirm the model is Totolink A8000RUAffected if The device is not a Totolink A8000RU router
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Check firmware versionLog into the router web interface or use firmware extraction tools to determine the installed firmware version; compare against any available version information from TotolinkAffected if Firmware version falls within any vulnerable range if published
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Verify web interface accessibilityAttempt to access the router's web management interface over HTTP/HTTPS (typically ports 80 or 443) from the networkAffected if The cstecgi.cgi endpoint is reachable over the network
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Test setPasswordCfg function exposureSend a crafted HTTP POST request to cstecgi.cgi with the setPasswordCfg function and a test parameter in the admpass field to observe if command injection occurs or if the parameter is passed unsanitized to system callsAffected if The admpass parameter accepts and processes unsanitized input without rejection or escaping
The environment is affected if it is a Totolink A8000RU router with the web management interface (cstecgi.cgi) accessible and the setPasswordCfg function accepts unsanitized admpass parameter input.
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 device's web management interface (disable WAN access, use VLANs or firewall rules). If vendor firmware updates are unavailable, consider replacing the device. Apply network segmentation to isolate affected devices.
- Consultation2.0 h
- Implementation4.0 h
- Testing2.0 h
- Review / QA1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-9476 — 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-2026-9476 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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