CVE-2026-9515
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 detected in Totolink CA750-PoE 6.2c.510. The affected element is the function setUnloadUserData of the file /cgi-bin/cstecgi.cgi of the component Setting Handler. The manipulation of the argument plugin_version results in os command injection. The attack may be launched remotely. The exploit is now public and may 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 CA750-PoE router firmware 6.2c.510. The setUnloadUserData function in the web interface CGI binary (/cgi-bin/cstecgi.cgi) fails to sanitize the plugin_version parameter, allowing remote attackers to inject and execute arbitrary OS commands on the underlying Linux system.
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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- Low
- Availability
- Low
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
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 device web interface or check the device label/marketing materials to confirm the model is Totolink CA750-PoEAffected if The device is not a Totolink CA750-PoE (unaffected models are not affected)
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Check the firmware versionLog into the device web interface and navigate to the status or system information page to view the installed firmware version; alternatively, check via the /cgi-bin/cstecgi.cgi endpoint or TFTP backup if availableAffected if The firmware version is exactly 6.2c.510 (only this specific version is listed as affected)
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Verify the vulnerable CGI binary existsAttempt to access the URI /cgi-bin/cstecgi.cgi on the device (e.g., via curl http://<device-ip>/cgi-bin/cstecgi.cgi)Affected if The CGI binary returns a response or error (presence indicates the vulnerable component is installed)
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Confirm remote web management is enabledCheck the device web interface under Network or Administration settings for 'Remote Management', 'Remote Access', or 'WAN Access' options; verify if the web interface is reachable from external IP addressesAffected if Remote web management is enabled and the device is accessible from WAN (this is required for remote exploitation)
The device is affected if it is a Totolink CA750-PoE running firmware version 6.2c.510 with the /cgi-bin/cstecgi.cgi endpoint accessible, particularly if remote web management is enabled.
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 network access to the router's administrative interface (disable WAN-facing management), and contact Totolink for firmware updates. If no patch is available, consider replacing the device with a model receiving active security support.
- 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-2026-9515 — 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-2026-9515 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
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