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N300rh FirmwareOperating system · Totolink

CVE-2026-3696

CRITICAL · 9.8 CVSS v3.1 Published 2026-03-08
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
100/100
Remediation priority · Urgent
Public exploit Remotely reachable No privileges Zero-click

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 · unedited
A vulnerability was found in Totolink N300RH 6..1c.1353_B20190305. The affected element is the function setWiFiWpsConfig of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Performing a manipulation results in os command injection. The attack can be initiated 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 confidence

OS command injection vulnerability in Totolink N300RH router's web CGI interface. The setWiFiWpsConfig function in /cgi-bin/cstecgi.cgi does not properly sanitize user input, allowing remote attackers to execute arbitrary operating system commands on the device.

MitigationApply vendor firmware update if available; otherwise restrict administrative interface access to trusted networks or replace the device, as the 2019 firmware date suggests potential end-of-life status with no security patches.

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
N300rh FirmwareOperating system
Affected:= 6.1c.1353_b20190305

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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify the router model
    Access the router web interface or physically check the device label to confirm it is a Totolink N300RH device
    Affected if The device is not a Totolink N300RH router
  2. Check the firmware version
    Log into the router web interface and navigate to the firmware/version status page, or check the label on the device for firmware version 6.1c.1353_b20190305
    Affected if The installed firmware version is 6.1c.1353_b20190305
  3. Verify web CGI interface accessibility
    Attempt to access the router web interface over HTTP/HTTPS on the local network to confirm the cstecgi.cgi endpoint is reachable
    Affected if The router web interface and /cgi-bin/cstecgi.cgi are accessible from the network

You are affected if you have a Totolink N300RH router running firmware version 6.1c.1353_b20190305 with the web interface accessible on your network.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Apply vendor firmware update if available; otherwise restrict administrative interface access to trusted networks or replace the device, as the 2019 firmware date suggests potential end-of-life status with no security patches.

Fix this in N300rh Firmware Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing3.0 h
  • Review / QA2.0 h
17.0 hours of engineering $3,050
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-3696 in production — separate from our analysis above.

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What this is

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What belongs here
  • 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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