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Command InjectionWeakness · CWE-77

CVE-2026-15486

MEDIUM · 6.3 CVSS v3.1 Published 2026-07-12
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
69/100
Remediation priority · Elevated
Remotely reachable Zero-click 5 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
A vulnerability has been found in TRENDnet TEW-821DAP 1.11B03. This affects the function sub_42026C of the file /goform/tools_ddns of the component Firmware Update Handler. Such manipulation of the argument hostname/username/password leads to os command injection. The attack can be launched remotely. The vendor explains: "We are unable to confirm the existence of the vulnerabilities for (...) TEW-821DAP (v1.0R) as these items have been EOL. " This vulnerability only affects products that are no longer supported by the maintainer.

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

OS command injection vulnerability in TRENDnet TEW-821DAP firmware 1.11B03. The /goform/tools_ddns handler fails to sanitize hostname, username, or password parameters before passing them to system commands in function sub_42026C, allowing remote attackers to inject arbitrary OS commands.

MitigationDevice is End-of-Life with no vendor patch available; recommended remediation is network isolation, restricting management interface access, or device replacement. No firmware update will be provided by vendor.

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
Low
Integrity
Low
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

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
    Check the device label or access the web management interface to confirm the model is TRENDnet TEW-821DAP
    Affected if Device is not a TEW-821DAP unit
  2. Check firmware version
    Access the router web interface, navigate to Status or System section, and look for the firmware version. Compare against 1.11B03
    Affected if Firmware version is 1.11B03
  3. Verify web interface is accessible
    Attempt to access the device web management interface on its IP address. The vulnerability exists in the /goform/tools_ddns HTTP handler
    Affected if Web interface is accessible on the network
  4. Check DDNS configuration access
    Navigate to the DDNS settings page in the web interface (typically under Tools or Advanced settings). The vulnerable parameters are hostname, username, and password fields
    Affected if DDNS configuration interface is available and accepts user input

If the device is a TEW-821DAP running firmware 1.11B03 and its web management interface is network-accessible, the environment is affected by this command injection vulnerability.

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

Device is End-of-Life with no vendor patch available; recommended remediation is network isolation, restricting management interface access, or device replacement. No firmware update will be provided by vendor.

Recommended fix High confidence
  1. 1. Acknowledge that this vulnerability cannot be patched by the vendor as the product TRENDnet TEW-821DAP is End-of-Life (EOL) and no longer supported.
  2. 2. Replace the affected EOL device (TRENDnet TEW-821DAP) with a currently supported model from TRENDnet or another vendor.
  3. 3. If replacement is not immediately possible, isolate the device on a restricted network segment to limit potential attack surface.
  4. 4. Implement network-level controls such as firewalls or VLANs to prevent unauthorized access to the device's management interface.
  5. 5. Monitor for any unusual activity or unauthorized access attempts targeting this device.

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

Have this fixed Scoped from the published advisory
  • Consultation1.0 h
  • Implementation2.0 h
  • Testing1.0 h
  • Review / QA1.0 h
5.0 hours of engineering $890
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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-2026-15486 in production — separate from our analysis above.

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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