CVE-2025-7836
Published: 19 July 2025
Summary
CVE-2025-7836 is a medium-severity Injection (CWE-74) vulnerability in Dlink Dir-816L Firmware. Its CVSS base score is 6.3 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 34.5% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Threat & Defense at a Glance
Threat & Defense Details
Likely Mitigating ControlsAI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Developer assessments and testing (including injection-focused techniques) identify improper neutralization of special elements, and the verifiable flaw remediation corrects them pre-deployment.
Identifies indicators of injection attacks (command, SQL, LDAP, etc.) via anomaly and attack monitoring.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Remote command injection vulnerability in the router's web CGI script (/htdocs/cgibin/lxmldbc_system) via environment variables enables exploitation of a public-facing application (T1190), exploitation of remote services (T1210), and arbitrary Unix shell command execution (T1059.004).
NVD Description
A vulnerability has been found in D-Link DIR-816L up to 2.06B01 and classified as critical. Affected by this vulnerability is the function lxmldbc_system of the file /htdocs/cgibin of the component Environment Variable Handler. The manipulation leads to command injection. The…
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attack can be launched remotely. The exploit has been disclosed to the public and may be used. This vulnerability only affects products that are no longer supported by the maintainer.
Deeper analysisAI
CVE-2025-7836 is a critical command injection vulnerability affecting D-Link DIR-816L routers running firmware up to version 2.06B01. The issue resides in the lxmldbc_system function within the /htdocs/cgibin file of the Environment Variable Handler component. Published on 2025-07-19, it is associated with CWE-74 and CWE-77, and carries a CVSS v3.1 base score of 6.3 (AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L). This flaw allows remote manipulation leading to arbitrary command execution.
Attackers with low privileges (PR:L) can exploit this vulnerability over the network with low complexity and no user interaction required. Successful exploitation enables limited impacts on confidentiality, integrity, and availability, such as executing arbitrary commands on the device.
References, including a GitHub repository detailing the remote arbitrary command execution exploit, VulDB entries, and the D-Link website, confirm the exploit has been publicly disclosed and may be actively used. The vulnerability exclusively impacts products no longer supported by the maintainer, with no patches available; mitigation relies on isolating or retiring affected devices.
Details
- CWE(s)