dbcve.org
Path TraversalWeakness · CWE-22

CVE-2025-34248

HIGH · 7.2 CVSS v4.0 Published 2025-10-09
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
78/100
Remediation priority · High
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
D-Link Nuclias Connect firmware versions < 1.3.1.4 contain a directory traversal vulnerability within /api/web/dnc/global/database/deleteBackup due to improper sanitization of the deleteBackupList parameter. This can allow an authenticated attacker to delete arbitrary files impacting the integrity and availability of the system.

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

D-Link Nuclias Connect firmware versions before 1.3.1.4 have a directory traversal vulnerability in the /api/web/dnc/global/database/deleteBackup API endpoint. The deleteBackupList parameter lacks proper sanitization, allowing an authenticated attacker to use path traversal sequences (e.g., ../../) to delete arbitrary files on the filesystem, affecting system integrity and availability.

MitigationUpgrade to firmware version 1.3.1.4 or later. Additionally, implement strict input validation and path sanitization on the deleteBackupList parameter to prevent directory traversal attacks.

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
Authentication
X
User interaction
None
Scope
X

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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 D-Link Nuclias Connect product deployment
    Identify if D-Link Nuclias Connect is deployed in your environment by checking the device model, product name, or system information visible in the web management interface or network inventory.
    Affected if The device or software is confirmed as D-Link Nuclias Connect.
  2. Check firmware version
    Locate the firmware version information in the web management interface (typically under System, Status, or About sections) or via CLI if available. Compare the installed version against the affected range.
    Affected if The firmware version is before 1.3.1.4.
  3. Verify vulnerable API endpoint exists
    Check if the /api/web/dnc/global/database/deleteBackup API endpoint is present and reachable on the device. This may be observable in API documentation, network traffic logs, or by accessing the endpoint with valid credentials.
    Affected if The deleteBackup API endpoint exists and is accessible.
  4. Confirm authentication is enabled
    Verify that authentication is required and enabled for accessing the web interface and API endpoints. An authenticated attacker is needed to exploit this vulnerability.
    Affected if Authentication is enabled for the web interface (the vulnerability requires an authenticated attacker to exploit the deleteBackupList parameter).

You are affected if you have D-Link Nuclias Connect firmware running a version before 1.3.1.4 where the /api/web/dnc/global/database/deleteBackup endpoint is accessible to authenticated users.

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

Upgrade to firmware version 1.3.1.4 or later. Additionally, implement strict input validation and path sanitization on the deleteBackupList parameter to prevent directory traversal attacks.

Recommended fix High confidence

1.3.1.4 or later

  1. Identify the D-Link Nuclias Connect device model currently in use
  2. Navigate to the D-Link support website and locate the firmware download section for the specific device model
  3. Download the latest firmware version 1.3.1.4 or later
  4. Access the Nuclias Connect web management interface
  5. Locate the firmware upgrade or system maintenance section
  6. Upload and apply the downloaded firmware file
  7. Verify the upgrade was successful by checking the firmware version in the system information
  8. Confirm the /api/web/dnc/global/database/deleteBackup endpoint now properly sanitizes the deleteBackupList parameter
Caveat Review release notes for any configuration changes or feature modifications between current and new firmware version

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

Have this fixed Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA3.0 h
21.0 hours of engineering $3,680
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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-2025-34248 in production — separate from our analysis above.

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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
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  • Version or environment caveats, and links to real fixes
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