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CVE-2026-51697 – Unauthenticated IPTV Configuration Tampering – TOTOLINK T6 Firmware 4.1.5cu.748_B20

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Summary

CVE-2026-51697 is an incorrect access control vulnerability (CWE-284) in the setIptvCfg function of the TOTOLINK T6 router running firmware 4.1.5cu.748_B20211015. It allows an unauthenticated remote attacker to alter the device’s IPTV service configuration by sending a crafted POST request to the router’s /cgi-bin/cstecgi.cgi endpoint. The flaw carries a CVSS v3.1 base score of 9.1 (Critical).

Technical details

  • Root cause: The setIptvCfg handler in the CGI web management interface (/cgi-bin/cstecgi.cgi) fails to enforce proper access control checks before processing configuration-changing requests.
  • Trigger conditions: An attacker sends a specially crafted HTTP POST request to /cgi-bin/cstecgi.cgi invoking the setIptvCfg function, without needing valid credentials or an authenticated session.
  • Attack vector: Network-based, no authentication or user interaction required, low attack complexity.
  • Impact: Unauthenticated modification of the device’s IPTV service configuration, which can disrupt network service or be leveraged to manipulate device behavior; the CVSS vector indicates a high confidentiality and integrity impact with no direct availability impact.

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: Check the TOTOLINK support/download portal for a firmware release beyond 4.1.5cu.748_B20211015 that addresses this access control flaw, and apply it as soon as it is available.
  • 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-side administration; place the device behind a firewall or VPN so the management interface is not directly internet-exposed; monitor for unexpected POST requests to /cgi-bin/cstecgi.cgi.

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: /cgi-bin/cstecgi.cgi, N600R (Firmware version V...), TOTOLINK

References

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