dbcve.org
Command InjectionWeakness · CWE-77

CVE-2026-7125

CRITICAL · 9.8 CVSS v3.1 Published 2026-04-27
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
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 identified in Totolink A8000RU 7.1cu.643_b20200521. Affected by this issue is the function setWiFiEasyCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. The manipulation of the argument merge leads to os command injection. The attack may be initiated remotely. The exploit is publicly available and might 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 A8000RU router firmware. The setWiFiEasyCfg function in /cgi-bin/cstecgi.cgi fails to sanitize the 'merge' argument, allowing remote attackers to execute arbitrary OS commands via the CGI interface.

MitigationUpdate router firmware if vendor releases patch; otherwise, restrict network access to the CGI endpoint or disable the affected WiFi easy configuration functionality.

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 checks

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

  1. Identify device model
    Access the router admin interface or check the device label to confirm the model is Totolink A8000RU
    Affected if Device is not a Totolink A8000RU router
  2. Check firmware version
    Log into the router admin panel and look for a firmware version number in the system or status settings, or check the vendor download page for the A8000RU
    Affected if Unable to determine firmware version or version is unpatched (compare against any vendor advisories)
  3. Verify CGI endpoint is accessible
    Attempt to reach http://<router-ip>/cgi-bin/cstecgi.cgi from an internal network host using a browser or curl command
    Affected if The CGI endpoint returns a response indicating it is reachable and functional
  4. Confirm WiFi Easy Config is enabled
    Check router wireless settings for WiFi Easy Configuration or WPS-related options, or inspect if the setWiFiEasyCfg function responds to CGI requests
    Affected if WiFi Easy Configuration feature is enabled and the CGI interface accepts the merge parameter

The device is affected if it is a Totolink A8000RU router with the vulnerable CGI endpoint accessible and WiFi Easy Configuration feature enabled.

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

Update router firmware if vendor releases patch; otherwise, restrict network access to the CGI endpoint or disable the affected WiFi easy configuration functionality.

Have this fixed Scoped from the published advisory
  • Consultation3.0 h
  • Implementation6.0 h
  • Testing3.0 h
  • Review / QA2.0 h
14.0 hours of engineering $2,490
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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-2026-7125 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
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  • Version or environment caveats, and links to real fixes
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