CVE-2026-2615
Published: 17 February 2026
Summary
CVE-2026-2615 is a high-severity Injection (CWE-74) vulnerability in Wavlink Wl-Nu516U1 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 35.2% 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-6 (Least Privilege).
Deeper analysis
CVE-2026-2615 is a command injection vulnerability in the singlePortForwardDelete function within the /cgi-bin/firewall.cgi file of Wavlink WL-NU516U1 routers running firmware up to version 20251208. The flaw arises from improper handling of the del_flag argument, allowing attackers to inject and execute arbitrary commands. It is rated with 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 is associated with CWE-74 (Improper Neutralization of Special Elements used in an SQL Command) and CWE-77 (Command Injection).
The vulnerability can be exploited remotely by authenticated users with high privileges, such as administrative access to the device. Attackers require low complexity to manipulate the del_flag argument during port forwarding deletion operations, potentially achieving high confidentiality, integrity, and availability impacts through arbitrary command execution on the underlying system.
Advisories from VulDB indicate that the vendor was contacted early regarding this disclosure but provided no response, and no patches or mitigations are mentioned. An exploit has been publicly disclosed on GitHub, including detailed proof-of-concept in repositories such as Wlz1112/Wavlink-NU516U1-V251208-, increasing the risk of active exploitation. Security practitioners should isolate affected devices, restrict administrative access, and monitor for anomalous activity until firmware updates are available.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-7662
Vulnerability details
A flaw has been found in Wavlink WL-NU516U1 up to 20251208. The affected element is the function singlePortForwardDelete of the file /cgi-bin/firewall.cgi. Executing a manipulation of the argument del_flag can lead to command injection. The attack may be launched remotely.…
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The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Command injection in internet-accessible router CGI (firewall.cgi) directly enables remote exploitation of a public-facing application (T1190) leading to arbitrary 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 neutralization of untrusted input such as the del_flag argument before it reaches the command interpreter in firewall.cgi.
Limits the number of accounts permitted to invoke singlePortForwardDelete, reducing the population that can reach the vulnerable code path.
Enforces boundary controls that can block or restrict remote administrative access to the router's web management interface from untrusted networks.