Command Injection Vulnerability in D-Link Products
CVE-2026-4203

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-2026-4203?

A command injection vulnerability has been identified in various D-Link DNS models. This vulnerability allows attackers to manipulate functions within the network management CGI script, specifically in the cgi_portforwarding and cgi_dhcpd sections. As a result, attackers can inject and execute arbitrary commands remotely, posing significant risks to affected devices. The exploit has been made public, making it crucial for users to apply necessary patches and secure their networks.

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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-2026-4203 - Proof of Concept

References

https://vuldb.com/?id.351115
vdb-entrytechnical-description
https://vuldb.com/?ctiid.351115
signaturepermissions-required
https://vuldb.com/?submit.770401
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

pjq123 (VulDB User)
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