dbcve.org
G416 FirmwareOperating system · Dlink

CVE-2023-50202

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 flupl pythonmodules 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-21295.

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

D-Link G416 routers contain a command injection vulnerability in the HTTP service (port 80) within the flupl pythonmodules component. The flaw results from insufficient validation of user-supplied input before passing it to a system call, allowing unauthenticated network-adjacent attackers to execute arbitrary code as the root user.

MitigationRestrict network access to the router's management interface and contact D-Link for a firmware patch. If the device cannot be patched immediately, consider network segmentation to limit 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
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
    Access the router's web interface or check the physical device label to confirm the model is D-Link G416
    Affected if The device is a D-Link G416 router
  2. Check the installed firmware version
    Log into the router's admin panel and navigate to the Status or System Information page to view the firmware version, or use the router's CLI if accessible
    Affected if The firmware version is lower than 1.09b01 (e.g., 1.08, 1.07, etc.)
  3. Verify the HTTP service is enabled
    Check if the router's web management interface on port 80 is accessible from the network
    Affected if HTTP service on port 80 is enabled and reachable
  4. Confirm the flupl component is present
    Inspect the router's filesystem or HTTP service configuration for the flupl pythonmodules component (this may require SSH/Telnet access to the device)
    Affected if The flupl pythonmodules component exists and handles HTTP requests

A D-Link G416 router with firmware version below 1.09b01 that has the HTTP service enabled with the flupl component present is affected by this command injection vulnerability.

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

Restrict network access to the router's management interface and contact D-Link for a firmware patch. If the device cannot be patched immediately, consider network segmentation to limit exposure.

Recommended fix Moderate confidence

Firmware version 1.09b01 or later

  1. 1. Navigate to the D-Link support page for the G416 router.
  2. 2. Download the firmware version 1.09b01 or later from the official D-Link support website.
  3. 3. Access the router's web management interface via http://192.168.0.1 or the default IP address.
  4. 4. Navigate to the Administration or System Settings section.
  5. 5. Locate the Firmware Upgrade option.
  6. 6. Upload the downloaded firmware file (1.09b01 or later) and apply the upgrade.
  7. 7. Wait for the router to complete the firmware update and reboot.
  8. 8. After reboot, verify the firmware version has been updated to 1.09b01 or higher in the router's status page.

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

Fix this in G416 Firmware Scoped from the published advisory
  • Consultation6.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA3.0 h
21.0 hours of engineering $3,780
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,048.

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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-2023-50202 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
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  • No spam, self-promotion, credentials, or personal data