CVE-2026-2129
Published: 08 February 2026
Summary
CVE-2026-2129 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 AC-6 (Least Privilege).
Deeper analysis
CVE-2026-2129 is an OS command injection vulnerability (CWE-77, CWE-78) in the D-Link DIR-823X router running firmware version 250416. The issue affects an unknown functionality within the /goform/set_ac_status file, where manipulation of the arguments ac_ipaddr, ac_ipstatus, or ap_randtime enables arbitrary command execution. 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) and was published on 2026-02-08.
The vulnerability is remotely exploitable over the network with low attack complexity but requires high privileges (PR:H) on the target system, with no user interaction needed. A successful exploit allows an attacker to achieve high impacts on confidentiality, integrity, and availability, potentially leading to full compromise of the affected router through injected operating system commands.
Advisories and details are documented in references including a GitHub issue at https://github.com/master-abc/cve/issues/23, multiple VulDB entries at https://vuldb.com/?ctiid.344764, https://vuldb.com/?id.344764, and https://vuldb.com/?submit.746935, as well as the D-Link website at https://www.dlink.com/. An exploit for this vulnerability has been made public and could be used.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-5819
Vulnerability details
A vulnerability was found in D-Link DIR-823X 250416. Affected by this issue is some unknown functionality of the file /goform/set_ac_status. Performing a manipulation of the argument ac_ipaddr/ac_ipstatus/ap_randtime results in os command injection. The attack may be initiated remotely. The exploit…
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has been made public and could be used.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
OS command injection in public-facing router web interface directly enables remote exploitation (T1190) and 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 (ac_ipaddr/ac_ipstatus/ap_randtime) to the /goform/set_ac_status endpoint, blocking OS command injection.
Limits the number of accounts and functions granted the high privileges (PR:H) required to reach the vulnerable form handler.
Restricts the router to only the minimal web-interface functions needed, reducing exposure of the set_ac_status command-injection surface.