CVE-2026-7139
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 flaw has been found in Totolink A8000RU 7.1cu.643_b20200521. This issue affects the function setWiFiAclRules of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. This manipulation of the argument mode causes os command injection. The attack is possible to be carried out remotely. The exploit has been published 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 A8000RU router's CGI handler (cstecgi.cgi). The setWiFiAclRules function fails to sanitize the 'mode' argument before passing it to system(), allowing remote attackers to execute arbitrary commands. The flaw is remotely exploitable and has a public exploit.
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 modelLog into the router web interface or check the device label to confirm the model is Totolink A8000RUAffected if Device is a Totolink A8000RU router
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Check the installed firmware versionIn the router web interface, navigate to System > Firmware or Status page to view the firmware version. Compare against any Totolink security advisories for CVE-2026-7139Affected if Firmware version is unpatched for this vulnerability
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Verify CGI interface accessibilityAttempt to access http://[router-ip]/cstecgi.cgi - the vulnerability is in this CGI handlerAffected if The cstecgi.cgi endpoint is reachable from the network
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Confirm if remote management is enabledIn the router web interface, check System > Administration > Remote Management to see if remote access via WAN is enabledAffected if Remote management is enabled and the web interface is exposed to untrusted networks
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Look for indicators of compromiseReview router configuration for unauthorized WiFi ACL rules, check for unexpected admin accounts, and monitor network traffic for suspicious command injection payloadsAffected if Unexpected WiFi ACL rules, new admin accounts, or unusual outbound connections are detected
A Totolink A8000RU router with unpatched firmware where the cstecgi.cgi interface is network-accessible is vulnerable to remote command injection via the WiFi ACL mode 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 dataRestrict network access to the router's management interface; disable remote administration if not needed; contact Totolink for firmware patch; monitor for indicators of compromise.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-7139 — 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-2026-7139 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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