OS Command Injection Vulnerability in D-Link DNS-340L
CVE-2026-85223

9.4CRITICAL

Key Information:

Vendor

D-link
Status
Dns-340l
Vendor
CVE Published:
3 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-85223?

A security flaw exists in the D-Link DNS-340L where an attacker can exploit the '/cgi-bin/dropbox.cgi' component. By manipulating the 'callback_url' and 'sync_interval' parameters, it is possible to execute arbitrary commands on the operating system. This vulnerability allows remote attackers to gain unauthorized access and potentially compromise system integrity. It is crucial for users to update their firmware to mitigate this risk.

Affected Version(s)

DNS-340L 1.01B04

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-2026-85223 - Proof of Concept

References

https://vuldb.com/vuln/398422
vdb-entrytechnical-description
https://vuldb.com/vuln/398422/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-85223
third-party-advisory

CVSS V4

Score:
9.4
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
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

ST4R0001 (VulDB User)
.