dbcve.org
G416 FirmwareOperating system · Dlink

CVE-2023-50199

HIGH · 8.8 CVSS v3.1 Published 2024-05-03
Fix available
A fix is available. Upgrade to 1.09b01 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 G416 httpd Missing Authentication for Critical Function Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of D-Link G416 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the HTTP service listening on TCP port 80. The issue results from the lack of authentication prior to allowing access to functionality. An attacker can leverage this vulnerability to gain access to critical functions on the device. Was ZDI-CAN-21287.

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 G416 router's HTTP service on TCP port 80 lacks authentication checks before granting access to critical functions. This allows network-adjacent attackers to bypass authentication entirely and invoke privileged operations, potentially leading to remote code execution.

MitigationApply the vendor-supplied firmware patch when available. If no patch exists, restrict network access to the router's management interface using firewall rules or network segmentation to limit exposure to trusted users 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
G416 FirmwareOperating system
Affected:< 1.09b01

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. Confirm device is D-Link G416
    Access the router's web interface and check the device model on the status page, or inspect the device label/packaging
    Affected if Device is not a D-Link G416 router
  2. Check firmware version
    Log into the router's web interface and navigate to the Status or Management page to view the firmware version. Alternatively, if telnet/SSH access is available, run 'nvram get firmversion' or check /proc/version
    Affected if Firmware version is lower than 1.09b01
  3. Verify HTTP service accessibility
    From a network-adjacent host, run 'nmap -p 80 <router_ip>' or use a browser to access http://<router_ip> on TCP port 80
    Affected if HTTP service on port 80 is accessible and responds

The environment is affected if it is a D-Link G416 router running firmware version prior to 1.09b01 and the HTTP management interface on port 80 is network-accessible.

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 1.09b01 or later
Fixed in 1.09b01
Interim mitigation

Apply the vendor-supplied firmware patch when available. If no patch exists, restrict network access to the router's management interface using firewall rules or network segmentation to limit exposure to trusted users only.

Recommended fix Moderate confidence

G416 Firmware version 1.09b01 or later

  1. 1. Identify the current firmware version by accessing the router's web interface at http://192.168.0.1 or using the D-Link app, and navigating to Settings > Management > Firmware Update.
  2. 2. Navigate to the official D-Link support page at support.dlink.com and search for the G416 product.
  3. 3. Download the latest firmware version (1.09b01 or later) from the official D-Link support site - ensure the file is directly from dlink.com or their authorized download portal.
  4. 4. In the router's web interface, go to Settings > Management > Firmware Update and use the manual firmware upload option to apply the downloaded firmware file.
  5. 5. Wait for the firmware update to complete - do not power off the router during this process.
  6. 6. After the router restarts, verify the firmware version has been updated to 1.09b01 or later.
  7. 7. As a security precaution after update, change the default administrator password if it has not been changed.
Caveat Firmware updates may reset router configuration to defaults; reconfigure your network settings after upgrading. Review D-Link release notes for any configuration changes.

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

Fix this in G416 Firmware Scoped from the published advisory
  • Consultation3.0 h
  • Implementation4.0 h
  • Testing2.0 h
  • Review / QA2.0 h
11.0 hours of engineering $1,980
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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-2023-50199 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