CVE-2026-6483
Published: 17 April 2026
Summary
CVE-2026-6483 is a high-severity Command Injection (CWE-77) vulnerability in Wavlink WL-WN530H4 (inferred from references). 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 11.6th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 RA-5 (Vulnerability Monitoring and Scanning) and SI-10 (Information Input Validation).
Deeper analysis
CVE-2026-6483 is an OS command injection vulnerability in the Wavlink WL-WN530H4 router firmware version 20220721. The issue resides in the strcat and snprintf functions within the /cgi-bin/internet.cgi script, where improper input handling allows attackers to inject and execute arbitrary operating system commands. This flaw, classified under CWE-77 (Command Injection) and CWE-78 (OS Command Injection), 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), indicating high severity due to its potential for significant impact on confidentiality, integrity, and availability.
Exploitation requires network access with high privileges, such as administrative authentication to the device, and low attack complexity with no user interaction needed. A remote attacker with these privileges can manipulate inputs to the affected CGI endpoint, injecting commands that execute in the context of the web server process. Successful exploitation enables full control over the router, including data exfiltration, modification of configurations, or disruption of network services.
Vendor guidance recommends upgrading to firmware version 2026.04.16, available via the official download link, to address the vulnerability. A proof-of-concept exploit has been publicly disclosed on GitHub, detailing the command injection in the set_add_routing functionality, as documented in VulDB advisories. No additional mitigations are specified beyond the patch.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-23403
Vulnerability details
A vulnerability was found in Wavlink WL-WN530H4 20220721. This vulnerability affects the function strcat/snprintf of the file /cgi-bin/internet.cgi. The manipulation results in os command injection. It is possible to launch the attack remotely. The exploit has been made public and…
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could be used. Upgrading to version 2026.04.16 is able to resolve this issue. Upgrading the affected component is recommended.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
OS command injection in public-facing CGI script directly enables exploitation of public-facing application (T1190) and arbitrary Unix shell command execution on the router (T1059.004).
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly mitigates the OS command injection vulnerability by requiring timely installation of the vendor-recommended firmware upgrade to version 2026.04.16.
Prevents command injection by enforcing input validation and error handling at the vulnerable /cgi-bin/internet.cgi interface using strcat/snprintf.
Detects the publicly disclosed CVE-2026-6483 through vulnerability scanning of the router firmware and triggers remediation via patching.