CVE-2026-16332 in DNS-320
Summary
by MITRE • 07/21/2026
A vulnerability was detected in D-Link DNS-320 1.0.2. This impacts an unknown function of the file /mydlink/multi_uploadify.php. Performing a manipulation of the argument Filedata[] results in unrestricted upload. The attack is possible to be carried out remotely. The exploit is now public and may be used.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 07/21/2026
The vulnerability identified in D-Link DNS-320 version 1.0.2 represents a critical security flaw within the device's web interface that allows for unauthorized file uploads through the /mydlink/multi_uploadify.php script. This issue falls under the category of unrestricted file upload vulnerabilities, which are particularly dangerous as they enable attackers to bypass normal file validation mechanisms and potentially execute malicious code on the affected system. The vulnerability specifically manifests when manipulating the Filedata[] argument parameter within the multi_uploadify.php function, creating an attack vector that can be exploited remotely without requiring physical access or authentication credentials.
The technical nature of this flaw stems from inadequate input validation and sanitization within the file upload functionality of the D-Link DNS-320 device. When the Filedata[] parameter is manipulated, the system fails to properly validate the file type, content, or extensions being uploaded, allowing arbitrary files to be stored on the device's storage system. This vulnerability aligns with CWE-434 which specifically addresses "Unrestricted Upload of File with Dangerous Type" and represents a classic example of how insufficient validation can lead to complete system compromise. The attack surface is particularly concerning as it operates over network protocols, making exploitation possible from any remote location with network access to the device.
The operational impact of this vulnerability extends far beyond simple file upload capabilities, as it creates a potential gateway for more sophisticated attacks within the network ecosystem. An attacker who successfully exploits this vulnerability could potentially upload web shells, malware, or other malicious payloads that would execute with the privileges of the web server process on the DNS-320 device. This could lead to complete system compromise including unauthorized access to stored data, potential use as a pivot point for attacking other devices within the local network, and possible disruption of network services. The public availability of exploitation tools increases the risk profile significantly as it removes the requirement for advanced technical skills to carry out attacks against vulnerable installations.
Security professionals should immediately implement mitigations including network segmentation to isolate affected devices from critical network segments, disabling unnecessary web interface access where possible, and implementing proper file type validation mechanisms at the network level. The ATT&CK framework categorizes this vulnerability under T1190 "Exploit Public-Facing Application" and potentially T1059 "Command and Scripting Interpreter" when considering the execution of uploaded malicious files. Organizations should also consider deploying intrusion detection systems capable of identifying suspicious file upload patterns and implementing regular security assessments to identify similar vulnerabilities across their network infrastructure. Additionally, firmware updates from D-Link should be prioritized once available, as these typically contain patches addressing such critical security flaws that could otherwise enable persistent threats within the organization's network environment.