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Ac7 FirmwareOperating system · Tenda

CVE-2025-1851

HIGH · 8.8 CVSS v3.1 Published 2025-03-03
Fix available
A fix is available. Upgrade to 15.03.06.44 or later.
See remediation →
94/100
Remediation priority · Urgent
Remotely reachable 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, which was classified as critical, was found in Tenda AC7 up to 15.03.06.44. This affects the function formSetFirewallCfg of the file /goform/SetFirewallCfg. The manipulation of the argument firewallEn leads to stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been disclosed to the public 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 confidence

Stack-based buffer overflow in Tenda AC7 routers (firmware up to 15.03.06.44) in the formSetFirewallCfg function within /goform/SetFirewallCfg. The firewallEn parameter is not properly validated before being copied to a fixed-size stack buffer, allowing remote attackers to overwrite stack memory and potentially execute arbitrary code.

MitigationUpdate to a patched firmware version once available from Tenda; until then, disable remote administration interfaces or block access to the /goform/SetFirewallCfg endpoint at the network edge.

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
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/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 web interface or check the device label to confirm the model is Tenda AC7
    Affected if Device is not a Tenda AC7 router - different models are not affected by this specific CVE
  2. Check firmware version
    Log into the router web interface and navigate to System Management > Firmware Upgrade, or use the Tenda app, to view the current firmware version
    Affected if Firmware version is below 15.03.06.44 (any version up to and including 15.03.06.43 is affected)
  3. Verify web interface accessibility
    Attempt to access the router's web interface from an external IP address (outside the local network) using HTTP/HTTPS on common admin ports (80, 8080, 443)
    Affected if Remote web administration is enabled and the interface is reachable from the internet
  4. Check if vulnerable endpoint is exposed
    Send an HTTP POST request to http://[router-external-ip]/goform/SetFirewallCfg (or the appropriate port if not 80) and observe if a response is received
    Affected if The /goform/SetFirewallCfg endpoint responds to remote requests, indicating it is accessible from outside the local network

A user is affected if they have a Tenda AC7 router running firmware version 15.03.06.44 or lower AND the router's web administration interface (including the /goform/SetFirewallCfg endpoint) is accessible from the internet.

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
Upgrade available Upgrade to 15.03.06.44 or later
Fixed in 15.03.06.44
Interim mitigation

Update to a patched firmware version once available from Tenda; until then, disable remote administration interfaces or block access to the /goform/SetFirewallCfg endpoint at the network edge.

Recommended fix Moderate confidence

Tenda AC7 Firmware version 15.03.06.44 or later (check www.tenda.com.cn for the latest available stable release)

  1. 1. Identify the current firmware version of the Tenda AC7 router by accessing the web management interface at http://192.168.0.1 or the IP address assigned to the router
  2. 2. Navigate to the administration or system settings section to view the current firmware version
  3. 3. Visit the official Tenda support page at www.tenda.com.cn and locate the AC7 product downloads section
  4. 4. Download the latest available firmware version for the AC7 router
  5. 5. In the router's web management interface, locate the firmware upgrade section (typically under System Tools > Firmware Upgrade or similar)
  6. 6. Upload the downloaded firmware file and initiate the upgrade process
  7. 7. Wait for the upgrade to complete and the router to reboot automatically
  8. 8. After reboot, verify the new firmware version in the router's administration settings
Caveat Review Tenda's release notes for any configuration reset requirements or feature changes between versions

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

Fix this in Ac7 Firmware Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA4.0 h
22.0 hours of engineering $3,860
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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-2025-1851 in production — separate from our analysis above.

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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