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Dir X3260 FirmwareOperating system · Dlink

CVE-2023-51622

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 SetTriggerPPPoEValidate 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-21672.

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

This is a stack-based buffer overflow vulnerability in the prog.cgi binary of D-Link DIR-X3260 routers. The flaw exists in the HNAP request handler within the lighttpd web server due to insufficient validation of user-supplied strings before copying them to a fixed-size stack buffer. An authenticated, network-adjacent attacker can exploit this to execute arbitrary code in the context of the root user.

MitigationApply the vendor-supplied firmware update when released. Until then, restrict access to the router's web interface to trusted users only, disable remote management if not required, and monitor for indicators of compromise.

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 device model
    Check if the target device is a D-Link DIR-X3260 router by accessing the router's web interface or checking the device label/menu
    Affected if Device is a D-Link DIR-X3260 model
  2. Check the firmware version
    Log into the router's web interface and navigate to the Status or System Information page to view the firmware version, or use the command line to check if available
    Affected if Firmware version is below 1.04b01 (versions like 1.04, 1.03, etc.)
  3. Verify lighttpd web server is running
    Check if the router's web interface is accessible on ports 80 or 443, as the vulnerability exists in the prog.cgi binary served by lighttpd
    Affected if The web interface is accessible and the prog.cgi binary is present
  4. Confirm HNAP functionality is enabled
    Verify that HNAP (Home Network Administration Protocol) is enabled on the router, typically accessible via the web interface or by sending an HTTP request to /HNAP1/
    Affected if HNAP endpoint is reachable and the device responds to HNAP requests
  5. Assess network accessibility
    Determine if the router's management interface is exposed to untrusted networks, as the attacker must be network-adjacent
    Affected if The router's web interface is accessible from an untrusted or public network segment

The device is affected if it is a D-Link DIR-X3260 router running firmware version below 1.04b01 with the lighttpd web server and HNAP functionality accessible to an attacker on the network.

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 the vendor-supplied firmware update when released. Until then, restrict access to the router's web interface to trusted users only, disable remote management if not required, and monitor for indicators of compromise.

Recommended fix High confidence

Firmware version 1.04b01

  1. 1. Download the firmware version 1.04b01 or later from the official D-Link support website (supportannouncement.us.dlink.com)
  2. 2. Access the D-Link DIR-X3260 router web interface by navigating to the router's IP address (typically 192.168.0.1)
  3. 3. Log in with administrative credentials
  4. 4. Navigate to the Administration or System Settings section
  5. 5. Locate the Firmware Upgrade or Update option
  6. 6. Upload the downloaded firmware file (1.04b01 or later)
  7. 7. Wait for the firmware upload and installation to complete - do not power off the device
  8. 8. After reboot, verify the firmware version in the router settings to confirm the update was successful

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
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA4.0 h
22.0 hours of engineering $3,860
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Scan for this in your stack

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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-2023-51622 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