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CVE-2026-120195 – OS Command Injection (RCE) – WAVLINK WL-WN579A3-A firmware build 2026-03-10-94f93d

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Summary

CVE-2026-120195 is a critical OS command injection vulnerability (CWE-78 / CWE-77) in the Initial Setup Wizard of the WAVLINK WL-WN579A3-A router web interface. A remote, unauthenticated attacker can execute arbitrary commands on the device through the wlan_ssid parameter. The CVSS v3.1 base score is 10.0 (Critical).

Technical details

  • Root cause: the set_wzdgwMesh function in /cgi-bin/adm.cgi does not sufficiently validate the wlan_ssid parameter. According to the public write-up, the filter blocks only pipe characters and backticks, so semicolons, quotes, redirects and # can still be used to inject commands.
  • Trigger conditions (per the public write-up): the device is in the initial setup wizard state (UserInit=0), the default WiFi band configuration is D, and the request carries a Referer header containing ap.setup. No authentication or cookies are required.
  • Attack vector: network. The attacker sends a crafted POST request to /cgi-bin/adm.cgi.
  • Impact: arbitrary command execution on the router, with high impact to confidentiality, integrity and availability. A public exploit write-up exists.

Affected software

  • WAVLINK WL-WN579A3-A, firmware build 2026-03-10-94f93d4

Severity

  • CVSS v3.1 base score: 10.0 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R

Mitigation and recommended actions

  • Immediate: no vendor patch or advisory was identified during research. Check with WAVLINK for fixed firmware.
  • Do not expose the router web management interface to the internet.
  • Complete the initial setup wizard on any device still in its initial state, and restrict access to /cgi-bin/adm.cgi to trusted internal networks.
  • Monitor for unexpected POST requests to /cgi-bin/adm.cgi and for signs of device compromise.
  • Replace or isolate devices that cannot be updated.

References

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