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D-Link DNS-320 CVE-2026-16447

| EUVDEUVD-2026-46258 MEDIUM
Unrestricted Upload of File with Dangerous Type (CWE-434)
2026-07-21 VulDB GHSA-26m3-vrp2-m98f
D-Link PHP File Upload Dns 320
5.5
CVSS 4.0 · Vendor: VulDB
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Severity by source

Vendor (VulDB) PRIMARY
5.5 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
10.0 CRITICAL

Unauthenticated network upload to a PHP endpoint enables web shell execution, yielding full device compromise across all CIA dimensions with scope change to OS layer.

3.1 AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (VulDB).

CVSS VectorVendor: VulDB

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
Analysis Generated
Jul 21, 2026 - 14:32 vuln.today
CVSS changed
Jul 21, 2026 - 14:22 NVD
6.9 (MEDIUM) 5.5 (MEDIUM)
CVE Published
Jul 21, 2026 - 13:30 cve.org
MEDIUM 5.5

DescriptionCVE.org

A vulnerability has been found in D-Link DNS-320 1.0.2. Impacted is an unknown function of the file /web/jquery/uploader/multi_uploadify.php. The manipulation of the argument Filedata[] leads to unrestricted upload. Remote exploitation of the attack is possible. The exploit has been disclosed to the public and may be used.

AnalysisAI

Unrestricted file upload in D-Link DNS-320 firmware version 1.0.2 allows unauthenticated remote attackers to upload arbitrary files - including PHP web shells - via the Filedata[] parameter of the jQuery Uploadify handler at /web/jquery/uploader/multi_uploadify.php. Because the endpoint performs no file-type validation and the underlying server executes PHP, a successful upload can yield full operating system command execution on the device. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify internet-exposed DNS-320 web interface
Delivery
Send unauthenticated HTTP POST to /web/jquery/uploader/multi_uploadify.php
Exploit
Upload PHP web shell via Filedata[] parameter
Execution
Confirm file stored in web-accessible directory
Persist
Issue HTTP GET request to uploaded shell
Impact
Execute arbitrary OS commands on device
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Vulnerability AssessmentAI

Exploitation Exploitation requires network-layer access to the DNS-320 web management interface (typically TCP port 80 or 8080) and that the `/web/jquery/uploader/multi_uploadify.php` PHP endpoint is reachable and functional - no authentication is required, confirmed by the CVSS PR:N metric. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 base vector (AV:N/AC:L/AT:N/PR:N/UI:N) indicates a maximally favorable attack surface: network-reachable, no complexity barriers, no authentication, and no user interaction - exploitable from the internet against any exposed device. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An unauthenticated attacker sends a crafted HTTP POST request to `/web/jquery/uploader/multi_uploadify.php` on an internet-exposed DNS-320, embedding a PHP web shell as the value of the `Filedata[]` multipart parameter; a publicly available proof-of-concept (referenced via Feishu document in the CVE references) demonstrates this technique. The server stores the uploaded file in a web-accessible directory and the attacker issues a follow-up GET request to the shell's path, obtaining arbitrary OS command execution on the device. …
Remediation No vendor-released patch has been identified at time of analysis for D-Link DNS-320 version 1.0.2; given this device's likely end-of-life status, a firmware fix may not be forthcoming. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-16447 vulnerability details – vuln.today
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