CVE-2026-3661
Published: 07 March 2026
Summary
CVE-2026-3661 is a medium-severity Injection (CWE-74) vulnerability in Wavlink Wl-Nu516U1 Firmware. Its CVSS base score is 4.7 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 46.0th percentile by exploit likelihood (below the median); 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?
Command injection in exposed CGI endpoint (/cgi-bin/adm.cgi) directly enables remote arbitrary Unix command execution on the device firmware after valid admin authentication.
NVD Description
A flaw has been found in Wavlink WL-NU516U1 240425. This affects the function ota_new_upgrade of the file /cgi-bin/adm.cgi. This manipulation of the argument model causes command injection. It is possible to initiate the attack remotely. The exploit has been published…
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and may be used. The vendor was contacted early about this disclosure.
Deeper analysisAI
CVE-2026-3661 is a command injection vulnerability affecting the Wavlink WL-NU516U1 firmware version 240425. The flaw resides in the ota_new_upgrade function within the /cgi-bin/adm.cgi file, where manipulation of the model argument enables injection of arbitrary commands. It is remotely exploitable and classified under CWE-74 and CWE-77, with a CVSS v3.1 base score of 4.7 (AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L).
Attackers require high privileges, such as administrative access, to exploit this vulnerability over the network with low complexity and no user interaction. Successful exploitation grants limited impact, allowing low-level disclosure of information, modification of data, or denial of service.
References, including VulDB entries (ctiid.349550, id.349550, submit.758227) and a GitHub repository at jinhao118/cve/blob/main/WAVLINK_1.md, indicate that a public exploit is available for use. The vendor was contacted early about the disclosure, published on 2026-03-07.
Details
- CWE(s)