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Memory Buffer Bounds ErrorWeakness · CWE-119

CVE-2026-9429

HIGH · 8.8 CVSS v3.1 Published 2026-05-25
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
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 was found in Tenda F1202 1.2.0.20(408). Affected by this vulnerability is the function formWrlExtraSet of the file /goform/WrlExtraSet. Performing a manipulation of the argument delno results in stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been made public and could 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 · moderate confidence

Stack-based buffer overflow in Tenda F1202 router firmware 1.2.0.20(408) in the formWrlExtraSet function via the delno parameter. The vulnerability allows remote attackers to overflow a stack buffer, potentially enabling remote code execution.

MitigationApply vendor firmware update when available; otherwise restrict or disable the /goform/WrlExtraSet web interface function and review network exposure.

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
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. Confirm router model is Tenda F1202
    Access the router web interface or check the device label to verify the model is Tenda F1202
    Affected if The device is not a Tenda F1202 router - not affected
  2. Check installed firmware version
    Log into the router admin panel, navigate to System Status or Firmware Upgrade page to view the firmware version; alternatively, check via telnet/SSH if available
    Affected if The firmware version is exactly 1.2.0.20(408) - vulnerable version
  3. Verify the web interface is accessible
    Attempt to access the router HTTP/HTTPS interface at the default gateway IP (typically 192.168.0.1 or 192.168.1.1)
    Affected if The web interface is exposed and reachable on the network
  4. Confirm vulnerable endpoint exists
    Check if the /goform/WrlExtraSet endpoint is present by examining the firmware or attempting to access it via HTTP
    Affected if The /goform/WrlExtraSet endpoint exists and processes requests

A Tenda F1202 router is affected only if it runs firmware version 1.2.0.20(408) with the web interface and /goform/WrlExtraSet 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 vendor firmware update when available; otherwise restrict or disable the /goform/WrlExtraSet web interface function and review network exposure.

Have this fixed Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA1.0 h
10.0 hours of engineering $1,750
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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-2026-9429 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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