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CVE-2026-51730 – Unauthenticated Wi-Fi ACL Rule Tampering – TOTOLINK T6 4.1.5cu.748_B20211015

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Summary

CVE-2026-51730 is a critical incorrect access control vulnerability in the delWiFiAclRules function of the TOTOLINK T6 router’s web management interface. It allows a remote, unauthenticated attacker to delete Wi-Fi Access Control List (ACL) rules on the device by sending a crafted request to the router’s CGI endpoint, weakening the Wi-Fi access restrictions the device is supposed to enforce. It is rated CRITICAL with a CVSS v3.1 base score of 9.1.

Technical details

  • Root cause: The delWiFiAclRules function, exposed through the router’s cstecgi.cgi CGI handler, fails to verify that the requesting client is authenticated before processing requests to delete Wi-Fi ACL rules.
  • Trigger condition: An attacker sends a crafted POST request to /cgi-bin/cstecgi.cgi invoking the delWiFiAclRules function.
  • Attack vector: Network — no authentication, prior access, or user interaction is required, and attack complexity is low.
  • Impact: An unauthenticated remote attacker can remove existing Wi-Fi ACL rules, undermining the device’s Wi-Fi access-restriction controls. The CVSS vector reflects high confidentiality and integrity impact, with no impact to availability.

Affected software

  • TOTOLINK T6, firmware version 4.1.5cu.748_B20211015

Severity

  • CVSS v3.1 Base Score: 9.1 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Mitigation and recommended actions

  • Immediate: No vendor-confirmed patched firmware version was identified for this specific vulnerability at the time of writing. Check TOTOLINK’s official download page for the T6 model and apply the latest available firmware release.
  • If no patch is available: Restrict access to the router’s web management interface (/cgi-bin/cstecgi.cgi) to trusted internal networks only, disable remote/WAN-facing management access, and place the device behind a firewall or VPN to block untrusted network access to the CGI interface until a vendor fix is confirmed.

References

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