Command Injection Vulnerability in D-Link Network Products
CVE-2026-4209

5.3MEDIUM

Key Information:

Vendor

D-link
Status
Dns-120
Dnr-202l
Dns-315l
Dns-320
Vendor
CVE Published:
16 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-4209?

A command injection vulnerability has been identified in multiple D-Link network products. The issue arises from improper handling of user input in the /cgi-bin/account_mgr.cgi file. Functions such as cgi_create_import_users and cgi_user_modify are particularly vulnerable, allowing remote attackers to execute arbitrary commands. This vulnerability can be exploited via publicly available exploit scripts, compromising the security of affected devices.

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Affected Version(s)

DNR-202L 20260205

DNR-322L 20260205

DNR-326 20260205

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-2026-4209 - Proof of Concept

References

https://vuldb.com/?id.351120
vdb-entrytechnical-description
https://vuldb.com/?ctiid.351120
signaturepermissions-required
https://vuldb.com/?submit.770429
third-party-advisory

CVSS V4

Score:
5.3
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

pjqwudi (VulDB User)
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