CVE-2026-3301
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 security flaw has been discovered in Totolink N300RH 6.1c.1353_B20190305. Affected by this vulnerability is the function setWebWlanIdx of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. Performing a manipulation of the argument webWlanIdx results in os command injection. The attack can be initiated remotely. The exploit has been released to the public and may 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 N300RH router's web management interface (cstecgi.cgi). The setWebWlanIdx function fails to sanitize the webWlanIdx parameter before passing it to a system call, allowing remote attackers to execute arbitrary OS commands with root privileges. Public exploit available.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data= 6.1c.1349_b20181018= 6.1c.1353_b20190305CVSS 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 router modelCheck the device label or login to the web interface and look for the model number (N300RH) in the system information or status pageAffected if The device is not a Totolink N300RH router - this vulnerability only affects that specific model
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Check the firmware versionAccess the router's web management interface, navigate to System Status or Firmware Upgrade section, and locate the firmware version information. Compare it against the affected versions: 6.1c.1349_b20181018 or 6.1c.1353_b20190305Affected if The installed firmware version exactly matches one of the two affected versions listed (6.1c.1349_b20181018 or 6.1c.1353_b20190305)
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Verify web management interface accessibilityAttempt to access the router's web interface from the network where the router is deployed. Check if the cstecgi.cgi endpoint is reachable by accessing http://<router-ip>/cstecgi.cgiAffected if The web management interface (specifically the cstecgi.cgi endpoint) is accessible from the network you are testing from
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Confirm setWebWlanIdx function availabilitySend a request to the cstecgi.cgi endpoint with the setWebWlanIdx action and a test webWlanIdx parameter value to see if the function accepts and processes itAffected if The setWebWlanIdx function responds to requests and processes the webWlanIdx parameter without proper validation
You are affected if you have a Totolink N300RH router running firmware version 6.1c.1349_b20181018 or 6.1c.1353_b20190305, and the web management interface with the cstecgi.cgi endpoint is accessible and the setWebWlanIdx function accepts the webWlanIdx parameter.
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 update when available. Until then, disable remote web management interface access from WAN and restrict administrative access to trusted networks only.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-3301 — 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-2026-3301 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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