CVE-2026-3662
Published: 07 March 2026
Summary
CVE-2026-3662 is a medium-severity Injection (CWE-74) vulnerability in Wavlink Wl-Nu516U1 Firmware. Its CVSS base score is 5.1 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 47.8th 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-2026-3662 is a command injection vulnerability in the Wavlink WL-NU516U1 device running firmware version 240425. The issue resides in the usb_p910 function within the /cgi-bin/adm.cgi script, where manipulation of the Pr_mode argument enables arbitrary command execution. Classified under CWE-74 and CWE-77, it carries 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) and was published on 2026-03-07.
The vulnerability can be exploited remotely over the network with low complexity and no user interaction required, but demands high privileges (PR:H) from the attacker. Successful exploitation allows limited impacts: low confidentiality (C:L), integrity (I:L), and availability (A:L) violations through injected commands, potentially enabling unauthorized actions within the device's privileged context.
Advisories from VulDB and a related GitHub repository detail the vulnerability, noting that the exploit has been publicly disclosed and may be actively used. The vendor was contacted early regarding the issue, though no specific patches or mitigations are outlined in the available references.
The public disclosure of the exploit code heightens the risk for unpatched Wavlink WL-NU516U1 devices.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-10142
Vulnerability details
A vulnerability has been found in Wavlink WL-NU516U1 240425. This vulnerability affects the function usb_p910 of the file /cgi-bin/adm.cgi. Such manipulation of the argument Pr_mode leads to command injection. It is possible to launch the attack remotely. The exploit has…
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been disclosed to the public and may be used. The vendor was contacted early about this disclosure.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Command injection in exposed CGI web interface (adm.cgi) directly enables remote exploitation of a public-facing application (T1190) and results in arbitrary Unix shell command execution on the Linux-based firmware (T1059.004).
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly blocks command injection by validating/sanitizing the Pr_mode argument before it reaches usb_p910 in adm.cgi.
Restricts the high-privilege accounts that can reach the vulnerable /cgi-bin/adm.cgi endpoint, reducing the attack surface.
Requires timely patching or firmware updates to eliminate the publicly disclosed command-injection flaw in the Wavlink device.