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Stack-based Buffer OverflowWeakness · CWE-121

CVE-2024-51314

CRITICAL · 9.8 CVSS v3.1 Published 2026-07-20
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 4 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
The Tenda TX9 V22.03.02.20 firmware has a stack overflow vulnerability in the sub_424CE0 function of the file /goform/setMacFilterCfg.

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 · moderate confidence

A stack overflow vulnerability exists in the sub_424CE0 function within the /goform/setMacFilterCfg endpoint of Tenda TX9 firmware v22.03.02.20. This allows remote attackers to overflow a stack-based buffer, potentially enabling arbitrary code execution or device compromise.

MitigationUpdate to a patched firmware version if available; otherwise, restrict network access to the device's web interface and disable the MAC filter functionality until a fix is released.

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. Confirm Tenda TX9 router model
    Log into the router web interface or check the device label to verify the model is Tenda TX9
    Affected if Device is not a Tenda TX9 router (different models may have different vulnerabilities)
  2. Check firmware version
    Navigate to the router web interface System Settings or Firmware Upgrade page to view the current firmware version, or use the telnet/SSH interface and run 'cat /proc/version' or 'ver' command
    Affected if Firmware version is V22.03.02.20 (this is the specific version containing the vulnerability)
  3. Verify web management interface accessibility
    Attempt to access the router login page from both LAN and WAN interfaces by navigating to the router IP address in a web browser
    Affected if The /goform/setMacFilterCfg endpoint is reachable over the network (this is the vulnerable interface)
  4. Check if Mac Filter feature is enabled
    Log into the router web interface and navigate to the MAC Filtering or Access Control settings page to see if any filter rules are configured
    Affected if Mac Filter functionality is present and accessible (the vulnerability lies in the setMacFilterCfg function)

The environment is affected if it is a Tenda TX9 router running firmware V22.03.02.20 with the web management interface and Mac Filter feature accessible to an attacker.

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 to a patched firmware version if available; otherwise, restrict network access to the device's web interface and disable the MAC filter functionality until a fix is released.

Have this fixed Scoped from the published advisory
  • Consultation4.0 h
  • Implementation16.0 h
  • Testing8.0 h
  • Review / QA4.0 h
32.0 hours of engineering $5,600
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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-2024-51314 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
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