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Memory Buffer Bounds ErrorWeakness · CWE-119

CVE-2026-9428

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 has been found in Tenda F1202 1.2.0.20(408). Affected is the function fromPPTPUserSetting of the file /goform/PPTPUserSetting. Such manipulation of the argument delno leads to stack-based buffer overflow. The attack may be performed from remote. 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

A stack-based buffer overflow vulnerability exists in the fromPPTPUserSetting function of Tenda F1202 firmware 1.2.0.20(408) at the /goform/PPTPUserSetting endpoint. The overflow is triggered through the 'delno' parameter, allowing remote attackers to potentially execute arbitrary code or cause denial of service.

MitigationApply vendor-provided firmware patch when available; until then, restrict network access to the router's web interface or disable PPTP functionality if not required.

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. Identify the router model
    Check the device label or access the web administration interface and look for the model number displayed on the login page or in the system status section
    Affected if The device is a Tenda F1202 router
  2. Determine the firmware version
    Log into the router web interface and navigate to System Setup or Administration > Firmware Upgrade to view the current firmware version, or use the command 'cat /proc/version' via telnet/SSH if available
    Affected if The firmware version is 1.2.0.20(408)
  3. Check if PPTP service is enabled
    Log into the router web interface and look for VPN, PPTP, or Remote Access settings in the administration or advanced settings menu
    Affected if PPTP functionality is enabled on the device
  4. Verify access to the vulnerable endpoint
    Attempt to access http://router_ip/goform/PPTPUserSetting or check if port 80/443 is open and the PPTP user setting page is reachable without authentication
    Affected if The /goform/PPTPUserSetting endpoint is accessible from the network

The device is affected if it is a Tenda F1202 running firmware version 1.2.0.20(408) with PPTP service enabled and the web interface 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-provided firmware patch when available; until then, restrict network access to the router's web interface or disable PPTP functionality if not required.

Have this fixed Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA2.0 h
18.0 hours of engineering $3,200
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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-2026-9428 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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