dbcve.org
G416 FirmwareOperating system · Dlink

CVE-2023-50198

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 cfgsave Command Injection Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of D-Link G416 wireless 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 proper validation of a user-supplied string before using it to execute a system call. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-21286.

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

Command injection vulnerability in D-Link G416 routers in the cfgsave functionality of the HTTP service on TCP port 80. The lack of proper validation of user-supplied input before using it in a system call allows unauthenticated attackers to execute arbitrary code with root privileges.

MitigationSince this is a zero-day disclosure with no vendor patch currently available, immediately restrict network access to the router's web interface (port 80/tcp) from untrusted networks. Monitor for indicators of compromise and check vendor firmware release notes regularly for updates.

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. Identify the device model
    Check the router label or access the web interface and look for the model number displayed on the login page or status page. Confirm it is a D-Link G416.
    Affected if The device is not a D-Link G416 model.
  2. Determine the firmware version
    Access the router web interface (http://<router-ip>) and navigate to the status or firmware upgrade page to view the current firmware version. Alternatively, check the firmware file name if you have access to the device filesystem or backups.
    Affected if The firmware version is lower than 1.09b01 (e.g., 1.08, 1.07, etc.).
  3. Verify HTTP service is accessible
    Attempt to reach the router on TCP port 80 using a browser or a tool like curl: curl -I http://<router-ip>/
    Affected if The HTTP service responds and the cfgsave endpoint is reachable without authentication.
  4. Confirm cfgsave functionality is present
    Send a request to the cfgsave endpoint (typically /cfgsave or similar path in the G416 web interface) and observe if it accepts parameters without requiring authentication.
    Affected if The cfgsave function is exposed and accepts unauthenticated requests.

The device is affected if it is a D-Link G416 router running firmware version below 1.09b01 and its HTTP web interface (port 80) with the cfgsave functionality is accessible to the 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 1.09b01 or later
Fixed in 1.09b01
Interim mitigation

Since this is a zero-day disclosure with no vendor patch currently available, immediately restrict network access to the router's web interface (port 80/tcp) from untrusted networks. Monitor for indicators of compromise and check vendor firmware release notes regularly for updates.

Recommended fix Moderate confidence

G416 Firmware 1.09b01 or later stable release (check support.dlink.com for latest available)

  1. 1. Visit the official D-Link support page at support.dlink.com and search for the G416 router model.
  2. 2. Navigate to the firmware/download section for the G416.
  3. 3. Download the latest available firmware version (1.09b01 or later stable release).
  4. 4. Access the router's web management interface by connecting to the router via Ethernet or Wi-Fi and navigating to http://192.168.0.1 or http://dlinkrouter.local.
  5. 5. Locate the firmware upgrade section, typically under Administration, Maintenance, or System Settings.
  6. 6. Upload the downloaded firmware file and initiate the upgrade process.
  7. 7. Wait for the upgrade to complete (do not power off the router during this process).
  8. 8. After the router reboots, verify the firmware version in the management interface to confirm the update was successful.
Caveat Minor: Router will reboot during upgrade; ensure stable power and do not interrupt the process

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

Fix this in G416 Firmware Scoped from the published advisory
  • Consultation4.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA2.0 h
13.0 hours of engineering $2,330
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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-2023-50198 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