CVE-2023-50204
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 · uneditedD-Link G416 flupl pythonapp 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-21297.
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 · moderate confidenceD-Link G416 routers contain a command injection vulnerability in the HTTP service listening on TCP port 80. The flupl pythonapp fails to validate user-supplied input before passing it to a system call, allowing an unauthenticated attacker to execute arbitrary code with root privileges. This is a pre-auth RCE requiring only network adjacency to the device.
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< 1.09b01CVSS 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 checksWork through these to decide whether this CVE applies to you.
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Identify the device modelAccess the router's web interface or check the device label to confirm the model is D-Link G416Affected if The device is not a D-Link G416 model, then it is not affected by this specific CVE
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Check the firmware versionLog into the router admin panel and navigate to the Status or System Information page to view the installed firmware version, or use the command 'cat /proc/version' or check '/etc/firmware_version' if you have CLI accessAffected if The firmware version is lower than 1.09b01 (for example, 1.08 or earlier), indicating the device is running a vulnerable version
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Verify HTTP service is exposedCheck if TCP port 80 is open and listening on the router by scanning the device from the network using 'nmap -p 80 <router-ip>' or checking local firewall rules with 'iptables -L'Affected if The HTTP service on port 80 is accessible from the network (not blocked by firewall), meaning the attack surface is present
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Check for flupl applicationIf CLI access is available, look for the flupl python application by checking running processes with 'ps' or searching for flupl in the filesystem with 'find / -name '*flupl*' 2>/dev/null'Affected if The flupl application is present and running on the device, which is the vulnerable component for this CVE
The device is affected if it is a D-Link G416 router running firmware version lower than 1.09b01 with the HTTP service (port 80) accessible and the flupl application present.
Generated from the published advisory. Verify against your own configuration.
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 · scoped1.09b01
Apply any available firmware update from D-Link immediately; until a patch is released, disable remote administration interfaces, restrict network access to the router's management UI, and monitor for unauthorized activity.
D-Link G416 Firmware version 1.09b01 or later
- 1. Download the latest firmware version 1.09b01 or later from the official D-Link support website (support.dlink.com)
- 2. Access the D-Link G416 router web interface by navigating to the router's IP address (typically 192.168.0.1)
- 3. Log into the router administrative interface with valid credentials
- 4. Navigate to the firmware upgrade section (usually under Settings > Administration or Maintenance > Firmware Upgrade)
- 5. Upload the downloaded firmware file (.bin or .img)
- 6. Wait for the firmware upload and installation to complete - do not power off the router during this process
- 7. After reboot, verify the firmware version in the router admin panel to confirm successful upgrade
- 8. Reconfigure any custom settings that may have been reset to defaults
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation6.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-50204 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2023-50204 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- 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
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