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Path TraversalWeakness · CWE-22

CVE-2026-15204

MEDIUM · 5.3 CVSS v3.1 Published 2026-07-09
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
62/100
Remediation priority · Elevated
Remotely reachable No privileges Zero-click 6 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 was detected in TOTOLINK X5000R 9.1.0cu.2415_B20250515/9.1.0cu.2350_B20230313. Affected by this vulnerability is the function exportOvpn of the file /web/cgi-bin/cstecgi.cgi of the component OpenVPN Export. The manipulation results in path traversal. The attack may be launched remotely.

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

The TOTOLINK X5000R router firmware contains a path traversal vulnerability in the OpenVPN Export functionality. The exportOvpn function in /web/cgi-bin/cstecgi.cgi fails to properly validate or sanitize file path inputs, allowing an attacker to access files outside the intended directory through specially crafted path sequences.

MitigationApply vendor firmware update when available. As a temporary workaround, disable the OpenVPN export feature if not needed, or restrict access to the web management interface to trusted networks only.

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
Low
Integrity
None
Availability
None

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

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 TOTOLINK X5000R
    Affected if Device is not a TOTOLINK X5000R router
  2. Check firmware version
    Log into the router web interface and navigate to System > Firmware Upgrade or Status page to view the installed firmware version. Compare this version against any vendor release notes for CVE-2026-15204
    Affected if Firmware version is within the affected range and has not been patched
  3. Verify vulnerable CGI exists
    Check if the file /web/cgi-bin/cstecgi.cgi exists on the router firmware (accessible via firmware extraction or web request)
    Affected if The cstecgi.cgi file exists and contains the vulnerable exportOvpn function
  4. Confirm OpenVPN export is enabled
    Log into the router web interface and navigate to VPN > OpenVPN or OpenVPN Export settings to verify if the OpenVPN export feature is accessible or enabled
    Affected if OpenVPN export feature is enabled and accessible to the attacker

A user is affected if they own a TOTOLINK X5000R router running a vulnerable firmware version with the OpenVPN export feature enabled and the cstecgi.cgi CGI binary present.

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. As a temporary workaround, disable the OpenVPN export feature if not needed, or restrict access to the web management interface to trusted networks only.

Have this fixed Scoped from the published advisory
  • Consultation4.0 h
  • Implementation3.0 h
  • Testing4.0 h
  • Review / QA2.0 h
13.0 hours of engineering $2,300
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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-2026-15204 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
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data