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Ac7 FirmwareOperating system · Tenda

CVE-2025-11586

CRITICAL · 9.8 CVSS v3.1 Published 2025-10-10
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 determined in Tenda AC7 15.03.06.44. This affects an unknown function of the file /goform/setNotUpgrade. This manipulation of the argument newVersion causes stack-based buffer overflow. The attack is possible to be carried out remotely. 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 confidence

A stack-based buffer overflow vulnerability exists in the Tenda AC7 router firmware (v15.03.06.44) within the /goform/setNotUpgrade web interface handler. The newVersion parameter is not properly bounds-checked before being copied to a stack-allocated buffer, allowing an attacker to overwrite return addresses and achieve remote code execution without authentication.

MitigationApply vendor firmware patch when available; otherwise, restrict access to the router's web management interface from untrusted networks or disable remote administration to reduce attack surface.

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
Ac7 FirmwareOperating system
Affected:= 15.03.06.44

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 device model
    Check the router label or access the web interface and look for the model name (AC7) in the device info page
    Affected if Device is not a Tenda AC7 router, then not affected by this specific CVE
  2. Check the firmware version
    Access the router's web administration page, navigate to System Settings or Firmware Upgrade section, and locate the firmware version displayed. Alternatively, check the downloaded firmware file name or version text if you have the firmware binary.
    Affected if Firmware version is NOT exactly 15.03.06.44, then not affected by this CVE (only this specific version is listed as affected)
  3. Verify web interface accessibility
    Attempt to access the router's web interface by entering the router's IP address in a web browser. The default is typically 192.168.0.1 or 192.168.1.1.
    Affected if Web interface is accessible and responds, confirming the attack surface exists
  4. Confirm newVersion parameter handling
    Send a crafted HTTP POST request to /goform/setNotUpgrade with an oversized newVersion parameter (e.g., newVersion=AAA... repeated characters) and observe if the request triggers unusual behavior or crashes the web service
    Affected if The router responds without error or crashes to an oversized newVersion value, indicating the vulnerability may be present (this is a confirmatory test and should only be done in authorized testing)
  5. Check if remote administration is enabled
    In the router web interface, navigate to Advanced Settings or Remote Management and check if remote access from WAN is enabled
    Affected if Remote administration is enabled, the device is exposed to remote attack vectors for this vulnerability

A user is affected if they have a Tenda AC7 router running firmware version 15.03.06.44 with the web management interface accessible (especially if remote administration is enabled), as this specific version contains the stack-based buffer overflow in the setNotUpgrade handler's newVersion parameter.

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.

dbcve · scoped
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Apply vendor firmware patch when available; otherwise, restrict access to the router's web management interface from untrusted networks or disable remote administration to reduce attack surface.

Recommended fix Moderate confidence

Latest firmware version available from www.tenda.com.cn for Tenda AC7 (contact vendor for specific version number)

  1. 1. Identify the current firmware version of the Tenda AC7 router via the web management interface or physical device label
  2. 2. Access the Tenda official support page at www.tenda.com.cn and navigate to the AC7 product support section
  3. 3. Download the latest available firmware version for the AC7 from the official Tenda website
  4. 4. Access the router's web management interface (typically at 192.168.0.1) and navigate to the firmware upgrade section
  5. 5. Upload and apply the latest firmware version following the on-screen instructions
  6. 6. After reboot, verify the new firmware version matches the updated release
  7. 7. As an additional precaution, disable remote web management (WAN access) if not required, limiting attack surface to the local network only
Caveat Review release notes for any configuration reset requirements or feature changes before upgrading

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Ac7 Firmware Scoped from the published advisory
  • Consultation8.0 h
  • Implementation24.0 h
  • Testing16.0 h
  • Review / QA8.0 h
56.0 hours of engineering $9,760
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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-2025-11586 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
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  • No spam, self-promotion, credentials, or personal data