OS Command Injection Vulnerability in D-Link DNS-340L Add-On Center
CVE-2026-85222

9.4CRITICAL

Key Information:

Vendor

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

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-85222?

A vulnerability exists in the D-Link DNS-340L device, specifically within the Add-On Center component at the '/cgi-bin/addon_center.cgi' endpoint. This security flaw permits remote attackers to execute arbitrary OS commands by manipulating the f_name, f_url, f_flag, and f_login_user parameters. Given that the exploit has been publicly disclosed, it raises significant security concerns for users of this device. Those who manage or deploy the DNS-340L should take immediate steps to secure their systems and apply any available patches or updates.

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-2026-85222 - Proof of Concept

References

https://vuldb.com/vuln/398421
vdb-entrytechnical-description
https://vuldb.com/vuln/398421/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-85222
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)
.