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Dir X3260 FirmwareOperating system · Dlink

CVE-2023-51623

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 SetAPClientSettings 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-size stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-21673.

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

Stack-based buffer overflow in prog.cgi binary of D-Link DIR-X3260 routers. The vulnerability exists in the HNAP request handler running on lighttpd webserver (ports 80/443). Insufficient input validation allows an authenticated attacker to overwrite stack memory by providing an oversized string that gets copied to a fixed-size stack buffer without bounds checking, achieving arbitrary code execution as root.

MitigationApply vendor firmware update when available; prior to patch, restrict network access to the router's management interface (ports 80/443) and use strong authentication credentials to minimize exposure.

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 device model
    Access the router's web interface or check the device label to confirm the model is D-Link DIR-X3260
    Affected if The device is a D-Link DIR-X3260 router
  2. Check firmware version
    Log into the router web interface and navigate to the firmware/version status page, or use the router's administrative CLI if available, to determine the installed firmware version
    Affected if Firmware version is below 1.04b01 (e.g., 1.03 or earlier)
  3. Verify HNAP endpoint accessibility
    Attempt to access the HNAP handler by sending an HTTP request to http://<router-ip>/HNAP1/ or check if the endpoint responds to HNAP SOAP actions on ports 80/443
    Affected if The HNAP endpoint is reachable and responds to requests
  4. Check web server exposure
    Use a network scanner or telnet/nc to confirm ports 80 and 443 are open and accessible on the router's IP address
    Affected if The lighttpd web server on ports 80/443 is exposed to the network (especially untrusted networks)

A user is affected if they have a D-Link DIR-X3260 router running firmware version prior to 1.04b01 with the HNAP web interface accessible on ports 80/443.

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 vendor firmware update when available; prior to patch, restrict network access to the router's management interface (ports 80/443) and use strong authentication credentials to minimize exposure.

Recommended fix High confidence

Firmware version 1.04b01

  1. Download the firmware version 1.04b01 or later from the official D-Link support website (supportannouncement.us.dlink.com)
  2. Access the D-Link DIR-X3260 router web interface by navigating to the router's IP address (typically 192.168.0.1)
  3. Log in with administrator credentials
  4. Navigate to the Administration or Management section
  5. Locate the Firmware Upgrade or Router Update option
  6. Upload the downloaded firmware file (.bin or .img)
  7. Wait for the firmware upload and installation to complete - do not power off the router during this process
  8. After the router restarts, verify the firmware version has been updated to 1.04b01 or later in the system status page
Caveat Standard firmware upgrade - backup router configuration before upgrading; the upgrade may reset some settings to defaults

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
  • Implementation2.0 h
  • Testing3.0 h
  • Review / QA1.0 h
10.0 hours of engineering $1,790
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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-2023-51623 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
  • 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