CVE-2026-16330 in DNS-320
Summary
by MITRE • 07/21/2026
A weakness has been identified in D-Link DNS-320 1.0.2. The impacted element is an unknown function of the file /web/jquery/uploader/uploadify.php. This manipulation of the argument https:/ucn9h68n9289.feishu.cn/wiki/JJcTwHz7aiKeq6kSItMcoeSUnMc?from=from_copylink causes unrestricted upload. Remote exploitation of the attack is possible. The exploit has been made available to the public and could be used for attacks.
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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 that undermines the device's file upload functionality and exposes it to remote exploitation. This weakness resides within the /web/jquery/uploader/uploadify.php component which processes file uploads without proper validation mechanisms. The specific attack vector involves manipulation of the https:/ucn9h68n9289.feishu.cn/wiki/JJcTwHz7aiKeq6kSItMcoeSUnMc argument that serves as an input parameter, creating a pathway for unrestricted file upload capabilities. This vulnerability type aligns with CWE-434 which specifically addresses the improper restriction of uploads to a restricted directory, commonly known as unrestricted file upload or file inclusion vulnerabilities.
The technical implementation flaw stems from inadequate input validation and sanitization within the uploadify.php script that fails to properly authenticate or restrict file types being uploaded to the device. When an attacker manipulates the specified argument through the web interface, they can bypass normal upload restrictions and potentially execute arbitrary code on the affected device. The vulnerability's remote exploitability means that attackers do not require physical access or local network privileges to leverage this weakness, significantly expanding the attack surface. This characteristic places the vulnerability in alignment with ATT&CK technique T1190 which describes exploitation of remote services, specifically targeting web application vulnerabilities.
The operational impact of this vulnerability extends beyond simple unauthorized file uploads as it creates potential for complete system compromise. An attacker could upload malicious scripts or executables that would execute within the context of the web server, potentially leading to full system control. The presence of a publicly available exploit further amplifies the risk level, as it removes the requirement for advanced technical skills or custom development to carry out attacks. This vulnerability affects not just individual devices but also represents a broader concern for network security since compromised devices can serve as entry points for lateral movement within corporate networks. Organizations using D-Link DNS-320 devices face significant exposure to unauthorized access, data exfiltration, and potential use as command and control infrastructure for larger attack campaigns.
Mitigation strategies should focus on immediate patching of the affected firmware version and implementation of network-level restrictions to prevent unauthorized access to the device's web interface. Network segmentation and access controls should be enforced to limit exposure of vulnerable devices to untrusted networks. Additionally, implementing proper input validation mechanisms, file type restrictions, and upload directory permissions can help prevent similar vulnerabilities from occurring in other systems. Regular security assessments and vulnerability scanning should be conducted to identify potential weaknesses in network infrastructure components. Organizations should also consider implementing intrusion detection systems that monitor for suspicious upload activities and anomalous behavior patterns that could indicate exploitation attempts. The vulnerability demonstrates the critical importance of maintaining up-to-date firmware and conducting thorough security reviews of third-party web applications integrated into network devices.