CVE-2026-2143 D-Link DIR-823X DDNS Service set_ddns os command injection

High 8.6 Published 8 Feb 2026 Updated 23 Feb 2026

Remote attackers can execute arbitrary OS commands on D-Link DIR-823X routers via the DDNS service, requiring authentication.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-2143?

CVE-2026-2143 is a high-severity command injection vulnerability in D-Link DIR-823X, published on 8 Feb 2026. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

A security vulnerability has been detected in D-Link DIR-823X 250416. This issue affects some unknown processing of the file /goform/set_ddns of the component DDNS Service. The manipulation of the argument ddnsType/ddnsDomainName/ddnsUserName/ddnsPwd leads to os command injection. The attack is possible to be carried out remotely. The exploit has been disclosed publicly and may be used.

Weakness: CWE-78, CWE-77

Which versions are affected by CVE-2026-2143?

It affects 1 product.

Products include Dlink Dir-823x Firmware.

How do I fix CVE-2026-2143?

No fix has been published for CVE-2026-2143 yet. Limit exposure of the affected software until one is available.

Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.

Is CVE-2026-2143 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-2143 exists.

Sources

Also known as GHSA-3qcx-pmvv-pwf4.