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CVE-2026-51740 – Unauthenticated Denial of Service (killProcess) – TOTOLINK T6 4.1.5cu.748_B20211015

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Summary

CVE-2026-51740 is an incorrect access control vulnerability in the killProcess function of the TOTOLINK T6 web management interface, firmware version 4.1.5cu.748_B20211015. The flaw allows an unauthenticated remote attacker to send a crafted POST request that terminates critical device processes, resulting in denial of service. The issue carries a CVSS v3.1 base score of 9.8 (Critical).

Technical details

  • Root cause: the killProcess function, exposed through the device’s CGI interface, does not enforce authentication or authorization before executing the requested process-termination action.
  • Trigger condition: an attacker sends a crafted HTTP POST request to /cgi-bin/cstecgi.cgi invoking the killProcess function.
  • Attack vector: network-based, requires no authentication and no user interaction.
  • Impact: attacker can terminate critical services running on the router, disrupting device availability and functionality (denial of service).

Affected software

  • TOTOLINK T6, firmware version 4.1.5cu.748_B20211015

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: check TOTOLINK’s official download page for a firmware release that addresses this issue and update the T6 device as soon as a fix is available; no confirmed patched version was identified during research.
  • If no patch is available: restrict access to the device’s web management interface (including /cgi-bin/cstecgi.cgi) from untrusted networks, disable remote/WAN administration, and place management access behind a VPN or firewall ACL limiting it to trusted management hosts.

How IONIX identifies potentially affected assets

IONIX matches the following signals against data already collected when it crawled the asset; identifying the technology sends no request beyond that crawl.

  • Raw response body (HTML): /cgi-bin/cstecgi.cgi, N600R (Firmware version V...), TOTOLINK

References

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