Unrestricted File Upload Vulnerability in D-Link DNS-320 Device
CVE-2026-16331

6.9MEDIUM

Key Information:

Vendor

D-link
Status
Dns-320
Vendor
CVE Published:
21 July 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-16331?

A security flaw has been identified in the D-Link DNS-320 that allows attackers to perform unrestricted file uploads via the save_ajax.php script, potentially leading to unauthorized execution of files on the server. By manipulating the 'Malicious Handler' parameter, remote attackers can exploit this vulnerability to gain control over the affected device. This issue has been publicly disclosed, posing a significant risk to users who have not implemented available security measures.

Affected Version(s)

DNS-320 1.0.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-16331 - Proof of Concept

References

https://vuldb.com/vuln/380697
vdb-entrytechnical-description
https://vuldb.com/vuln/380697/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-16331
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

red88-debug (VulDB User)
.