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Dir X3260 FirmwareOperating system · Dlink

CVE-2023-51615

MEDIUM · 6.8 CVSS v3.1 Published 2024-05-03
Fix available
A fix is available. Upgrade to 1.04b01 or later.
See remediation →
70/100
Remediation priority · Elevated
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 DIR-X3260 prog.cgi SetQuickVPNSettings PSK Stack-Based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of D-Link DIR-X3260 routers. Authentication is required to exploit this vulnerability. The specific flaw exists within the prog.cgi binary, which handles HNAP requests made to the lighttpd webserver listening on TCP ports 80 and 443. The issue results from the lack of proper validation of a user-supplied string before copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-21592.

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 prog.cgi binary of D-Link DIR-X3260 routers. The SetQuickVPNSettings function fails to properly validate user-supplied string input before copying it to a fixed-length stack-based buffer. An authenticated attacker can exploit this to execute arbitrary code with root privileges.

MitigationApply available firmware updates from D-Link. If no update is available, disable remote administration interfaces and restrict access to the management UI to trusted networks only.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Dir X3260 FirmwareOperating system
Affected:< 1.04b01

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
Adjacent
Complexity
Low
Privileges
High
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:A/AC:L/PR:H/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 web interface for the exact model number. Confirm it is a D-Link DIR-X3260.
    Affected if The device is a D-Link DIR-X3260 router.
  2. Check the installed firmware version
    Access the router web management interface and navigate to the firmware or status page to view the current firmware version. Compare it to the affected range of versions prior to 1.04b01.
    Affected if The firmware version is lower than 1.04b01.
  3. Verify the prog.cgi binary is accessible
    Attempt to access the prog.cgi binary via the router web interface. The vulnerability exists in this binary's SetQuickVPNSettings function.
    Affected if The prog.cgi binary is present and accessible on the device.
  4. Confirm VPN functionality is enabled
    Check the router's VPN settings page in the web management interface to see if QuickVPN or related VPN features are configured or enabled.
    Affected if VPN features (specifically QuickVPN settings) are accessible or enabled on the router.
  5. Check if remote administration is accessible
    Determine whether the router's web management interface is reachable from external networks (WAN side). Look for remote management settings that allow access from outside the local network.
    Affected if Remote administration or management access is enabled and reachable from untrusted networks.

A user is affected if they own a D-Link DIR-X3260 router running firmware version prior to 1.04b01 with the prog.cgi interface accessible and VPN features enabled, especially if the management interface is exposed to untrusted networks.

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
Upgrade available Upgrade to 1.04b01 or later
Fixed in 1.04b01
Interim mitigation

Apply available firmware updates from D-Link. If no update is available, disable remote administration interfaces and restrict access to the management UI to trusted networks only.

Recommended fix High confidence

Firmware version 1.04b01 or later for D-Link DIR-X3260

  1. 1. Obtain firmware version 1.04b01 or later from the official D-Link support website (support.dlink.com) for the DIR-X3260 model
  2. 2. Connect to the router's web management interface via HTTP (port 80) or HTTPS (port 443)
  3. 3. Log in with administrator credentials
  4. 4. Navigate to the Administration or Management section of the web interface
  5. 5. Locate the Firmware Upgrade or Router Upgrade option
  6. 6. Upload the downloaded firmware file (1.04b01 or later) to the router
  7. 7. Wait for the firmware upload and installation process to complete (do not power off the router)
  8. 8. After reboot, verify the installed firmware version displays as 1.04b01 or higher in the router's status page
Caveat Firmware upgrades carry a risk of device brickage if interrupted; ensure stable power during the upgrade process

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

Fix this in Dir X3260 Firmware Scoped from the published advisory
  • Consultation4.0 h
  • Implementation16.0 h
  • Testing8.0 h
  • Review / QA4.0 h
32.0 hours of engineering $5,600
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $8,960.

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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-2023-51615 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