CVE-2026-2143
Published: 08 February 2026
Summary
CVE-2026-2143 is a high-severity Command Injection (CWE-77) vulnerability in Dlink Dir-823X Firmware. Its CVSS base score is 7.3 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 32.2th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).
Deeper analysis
CVE-2026-2143 is an OS command injection vulnerability affecting the D-Link DIR-823X router on firmware version 250416. The flaw occurs in the processing of the /goform/set_ddns file within the DDNS Service component, where manipulation of the arguments ddnsType, ddnsDomainName, ddnsUserName, and ddnsPwd enables command injection. It maps to CWE-77 (Command Injection) and CWE-78 (OS Command Injection) and was published on 2026-02-08.
The vulnerability carries a CVSS v3.1 base score of 7.2 (AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H), meaning it is remotely exploitable over the network with low complexity and no user interaction required, but demands high privileges such as administrative access. A successful attacker can achieve high impacts on confidentiality, integrity, and availability, potentially resulting in complete device compromise. The exploit has been publicly disclosed and may be used.
Advisories detailing the issue appear on VulDB (ctiid.344778, id.344778, submit.747492) and in a GitHub issue at master-abc/cve/issues/25, with the D-Link website also referenced among sources. No specific patch or mitigation details are outlined in the available references.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-5805
Vulnerability details
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…
more
to be carried out remotely. The exploit has been disclosed publicly and may be used.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
OS command injection in public-facing router web form (/goform/set_ddns) directly enables remote exploitation of the application (T1190) and arbitrary Unix shell command execution (T1059.004).
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly requires validation and sanitization of untrusted inputs (ddnsType, ddnsDomainName, ddnsUserName, ddnsPwd) to block OS command injection in /goform/set_ddns.
Limits the number and privileges of accounts authorized to reach the DDNS configuration endpoint, reducing the population that can trigger the injection.
Mandates timely application of vendor patches or firmware updates that eliminate the command-injection flaw in the DDNS service.