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Command InjectionWeakness · CWE-77

CVE-2026-38142

MEDIUM · 6.5 CVSS v3.1 Published 2026-07-01
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
74/100
Remediation priority · Elevated
Remotely reachable No privileges Zero-click 7 weeks old

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
An unauthenticated command injection vulnerability in the /goform/fast_setting_internet_set endpoint of Tenda AC18 v15.03.05.05 allows attackers to execute arbitrary commands via a crafted payload injected into the mac parameter.

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

An unauthenticated command injection vulnerability exists in the Tenda AC18 router firmware v15.03.05.05. The /goform/fast_setting_internet_set endpoint accepts user input through the mac parameter without proper sanitization, allowing attackers to inject and execute arbitrary operating system commands on the device.

MitigationApply the vendor firmware update when available; until then, restrict access to the router's management interface from untrusted networks using firewall rules or network segmentation.

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
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

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 your router's admin interface or check the physical device label to confirm it is a Tenda AC18 model
    Affected if The device is not a Tenda AC18 router
  2. Check the firmware version
    Log into the router web interface (typically at 192.168.0.1) and navigate to System Settings or Administration > Firmware Upgrade to view the current firmware version. Compare it to v15.03.05.05
    Affected if The installed firmware version is exactly v15.03.05.05
  3. Verify the vulnerable endpoint exists
    Attempt to access the URL path /goform/fast_setting_internet_set on the router's web interface using a web browser or curl command. A valid response (even an error) indicates the endpoint is present
    Affected if The endpoint responds, indicating the fast_setting_internet_set functionality is enabled on the device
  4. Confirm web management interface accessibility
    Verify the router's HTTP/HTTPS management interface is reachable on the local network. Check if remote management is enabled under System Settings > Remote Management
    Affected if The router web interface is accessible and the vulnerable endpoint is present

You are affected if you have a Tenda AC18 router running firmware version v15.03.05.05 with the /goform/fast_setting_internet_set endpoint accessible.

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 the vendor firmware update when available; until then, restrict access to the router's management interface from untrusted networks using firewall rules or network segmentation.

Have this fixed Scoped from the published advisory
  • Consultation3.0 h
  • Implementation3.0 h
  • Testing2.0 h
  • Review / QA1.0 h
9.0 hours of engineering $1,620
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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-2026-38142 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
  • 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
  • No spam, self-promotion, credentials, or personal data