What is the CVSS score of CVE-2026-2143?

CVE-2026-2143 has a CVSS 3.1 base score of 7.2 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of Dir 823x Firmware are affected by CVE-2026-2143?

A HIGH severity vulnerability in D-Link DIR-823X routers allows remote exploitation through the DDNS service without requiring authentication.

Is there a public PoC exploit available for CVE-2026-2143?

Yes, a public proof-of-concept exploit is available for CVE-2026-2143. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-2143?

Within 24 hours: Identify and inventory all D-Link DIR-823X devices in production environments and isolate affected units from critical network segments if possible. Within 7 days: Implement network-based mitigations (WAF rules blocking /goform/set_ddns requests, network segmentation to restrict DDNS service access, disable DDNS if not operationally required) and monitor for exploitation attempts. Within 30 days: Develop a device replacement or upgrade plan with D-Link to obtain patched firmware when available, or retire affected hardware if patches cannot be released.

Dir 823x Firmware CVE-2026-2143

HIGH

Command Injection (CWE-77)

2026-02-08 cna@vuldb.com

D-Link Command Injection Dir 823x Firmware

7.2

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.2 HIGH

AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

PoC Detected

Feb 10, 2026 - 14:57 vuln.today

Public exploit code

CVE Published

Feb 08, 2026 - 09:15 nvd

HIGH 7.2

DescriptionCVE.org

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.

AnalysisAI

Unauthenticated attackers can achieve remote code execution on D-Link DIR-823X routers through OS command injection in the DDNS service component via the /goform/set_ddns endpoint. The vulnerability allows manipulation of DDNS parameters (ddnsType, ddnsDomain, ddnsUserName, ddnsPwd) to execute arbitrary system commands with high privileges. Public exploit code exists and no patch is currently available.

Technical ContextAI

Classified as CWE-77 (Command Injection). Affects Dir-823X Firmware. 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.