CVE-2026-2084
Published: 07 February 2026
Summary
CVE-2026-2084 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 in the top 29.1% of CVEs by exploit likelihood; 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 AC-3 (Access Enforcement).
Deeper analysis
CVE-2026-2084 is an OS command injection vulnerability (CWE-77, CWE-78) affecting the D-Link DIR-823X router on firmware version 250416. The flaw resides in an unknown function of the web endpoint /goform/set_language, where manipulation of the langSelection argument triggers command injection. Published on 2026-02-07, it 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).
The vulnerability is exploitable remotely over the network with low complexity and no user interaction required, though it demands high privileges (PR:H), such as administrative access. Attackers can achieve high impacts on confidentiality, integrity, and availability, enabling arbitrary OS command execution and potential full device compromise.
References point to VulDB advisories (ctiid.344651, id.344651, submit.746379, submit.746380) and a GitHub issue (master-abc/cve/issues/24). An exploit is publicly available, heightening the risk of real-world attacks, though no specific patch or mitigation details are outlined in the provided sources.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-5729
Vulnerability details
A weakness has been identified in D-Link DIR-823X 250416. This impacts an unknown function of the file /goform/set_language. Executing a manipulation of the argument langSelection can lead to os command injection. It is possible to launch the attack remotely. The…
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exploit has been made available to the public and could be used for attacks.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
OS command injection in exposed web management endpoint directly enables remote exploitation of public-facing application (T1190) and Unix shell command execution (T1059.004).
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly blocks manipulation of the langSelection argument in /goform/set_language by enforcing validation and sanitization of untrusted input before OS command execution.
Limits the high-privilege accounts (PR:H) required to reach the vulnerable endpoint, reducing the population of users who can trigger the command injection.
Enforces access-control policy on the specific web function so that only explicitly authorized subjects may invoke set_language, preventing unauthorized command execution even when credentials exist.