Is this vulnerability remotely exploitable over the internet?

It can be, depending on how the router is deployed. If remote management or the web interface is accessible from the WAN side (or unintentionally exposed via port forwarding or misconfiguration), an attacker on the internet may be able to reach the vulnerable `/goform/set_ddns` endpoint. If management access is limited to the internal network, an attacker would generally need local network access or control of a device inside that network.

What level of access does an attacker need to exploit this issue?

The attacker needs the ability to send HTTP requests to the router's management interface. In many home or small-office settings, this means being on the same LAN or Wi-Fi network. If authentication is required for DDNS configuration and is properly enforced, valid credentials would also be necessary; however, the precise authentication posture should not be assumed secure without verification.

What is the safest general fix pattern for developers working on similar firmware code?

The safest pattern is to avoid constructing shell commands from user-controlled input entirely. Use dedicated APIs or libraries for DDNS and network management operations, and when interaction with system utilities is unavoidable, pass arguments as data through non-shell process execution functions. Combine this with stringent input validation and least-privilege execution for all management components.

Severity:

HIGH RISK

(7.2)

OS Command Injection (CWE-78) in D-Link DIR-823X DDNS Service Endpoint

CVE-2026-2143

Published:

Feb 8, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-306

CRITICAL RISK

CRITICAL

(9.8)

Missing Authentication for Forgot-Password Email Change API (CWE-306)

Account Takeover / Loss of Account Control

February 17, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Remote Code Execution on the Server Host

February 17, 2026

Vulnerability Type

Category:

OS Command Injection

CWE:

CWE-77;CWE-78

Impact:

Remote Code Execution on Embedded Device

Severity:

HIGH RISK

(7.2)

CVSS Version:

3.1

Vulnerability Type

Category:

OS Command Injection

CWE:

CWE-77;CWE-78

Impact:

Remote Code Execution on Embedded Device

Severity:

HIGH RISK

(7.2)

CVSS Version:

3.1

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355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

OS Command Injection (CWE-78) in D-Link DIR-823X DDNS Service Endpoint

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

CRITICAL RISK

CRITICAL

(9.8)

Missing Authentication for Forgot-Password Email Change API (CWE-306)

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Vulnerability Type

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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