CVE-2026-7242
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 determined in Totolink A8000RU 7.1cu.643_b20200521. Impacted is the function setOpenVpnClientCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Executing a manipulation of the argument enabled can lead to os command injection. The attack may be performed from remote. The exploit has been publicly disclosed and may be utilized.
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 /cgi-bin/cstecgi.cgi CGI handler. The setOpenVpnClientCfg function fails to properly sanitize user input passed through the 'enabled' parameter, allowing remote unauthenticated attackers to execute arbitrary operating system commands on the device.
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 the device modelCheck the router label or web interface for the model number to confirm it is a Totolink A8000RUAffected if The device is not a Totolink A8000RU router - other models are not affected by this specific CVE
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Check the firmware versionLog into the router web interface and look for the firmware version in the system status or administration settings, or use the command 'cat /proc/version' or 'nvram get firm_version' via telnet/ssh if availableAffected if The firmware version is 7.1cu.643_b20200521 - this is the exact affected version
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Verify the vulnerable CGI endpoint existsAttempt to access http://<router-ip>/cgi-bin/cstecgi.cgi via HTTP request and check for a responseAffected if The endpoint responds - confirms the CGI handler is present on the device
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Check if OpenVPN client feature is configuredIn the router web interface, navigate to the VPN or OpenVPN client settings section and look for any OpenVPN client configuration optionsAffected if OpenVPN client functionality is available/enabled on the device - the command injection occurs through the 'enabled' parameter of the setOpenVpnClientCfg function
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Verify web management interface exposureCheck if the router's web interface (ports 80/443) is accessible from untrusted networks or the internet by testing remote connectivity to the CGI endpointAffected if The router web interface is exposed to untrusted networks - remote unauthenticated attackers need network access to the cgi-bin/cstecgi.cgi endpoint
You are affected if you have a Totolink A8000RU router running firmware version 7.1cu.643_b20200521 with the OpenVPN client feature accessible from a network where untrusted users can reach the web interface.
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 available firmware补丁 if released by Totolink; otherwise disable the OpenVPN client functionality, restrict administrative interface access to trusted networks, or implement network segmentation to limit exposure.
- Consultation3.0 h
- Implementation2.0 h
- Testing4.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-7242 — 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-2026-7242 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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