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Dir X3260 FirmwareOperating system · Dlink

CVE-2023-44420

HIGH · 8.8 CVSS v3.1 Published 2024-05-03
Fix available
A fix is available. Upgrade to 1.04b01 or later.
See remediation →
93/100
Remediation priority · Urgent
No privileges 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 Incorrect Implementation of Authentication Algorithm Authentication Bypass Vulnerability. This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of D-Link DIR-X3260 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the prog.cgi executable. The issue results from an incorrect implementation of the authentication algorithm. An attacker can leverage this vulnerability to bypass authentication on the device. Was ZDI-CAN-21100.

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

The D-Link DIR-X3260 router contains a vulnerability in the prog.cgi executable where the authentication algorithm is incorrectly implemented, allowing network-adjacent attackers to bypass authentication entirely without needing valid credentials.

MitigationApply the vendor firmware patch when available. Until then, restrict network access to the router's management interface by placing it behind a firewall or VPN, and disable remote management if enabled.

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
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:A/AC:L/PR:N/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
    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 not a D-Link DIR-X3260 router (different models are not affected by this specific CVE)
  2. Check the installed firmware version
    Log into the router web interface and navigate to Status or Management section to view the firmware version, or use the command 'grep VERSION /etc/os-release' or similar via SSH/Telnet if available
    Affected if The firmware version is lower than 1.04b01 (versions from 1.00 through 1.04b00 are affected)
  3. Verify prog.cgi endpoint accessibility
    Attempt to access the prog.cgi endpoint on the router (typically at http://<router-ip>/prog.cgi) from a network-adjacent position
    Affected if The prog.cgi endpoint is reachable from the network and responds to requests without requiring authentication
  4. Check if remote management is enabled
    In the router web interface, go to Management > Remote Management or similar section to see if remote access over WAN is enabled
    Affected if Remote management is enabled and the router is directly exposed to the internet or an attacker has network adjacency to the management interface

A user is affected if they own a D-Link DIR-X3260 router running firmware version below 1.04b01 and the prog.cgi authentication bypass can be exploited by a network-adjacent attacker.

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 firmware patch when available. Until then, restrict network access to the router's management interface by placing it behind a firewall or VPN, and disable remote management if enabled.

Recommended fix High confidence

Firmware version 1.04b01 or later

  1. 1. Access the D-Link DIR-X3260 router web interface via its IP address
  2. 2. Navigate to the Administration or System settings section
  3. 3. Locate the Firmware Upgrade or Router Update option
  4. 4. Check the current firmware version to confirm it is below 1.04b01
  5. 5. Download the latest firmware version 1.04b01 or later from the official D-Link support website
  6. 6. Upload and apply the firmware update through the router's web interface
  7. 7. Wait for the router to reboot and complete the upgrade process
  8. 8. Verify the new firmware version is 1.04b01 or later after reboot
Caveat Firmware upgrades may reset router configuration to defaults; back up current settings before upgrading if needed

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

Fix this in Dir X3260 Firmware Scoped from the published advisory
  • Consultation3.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA2.0 h
12.0 hours of engineering $2,130
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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-2023-44420 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