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CVE-2026-51725 – Unauthenticated Device Clock Manipulation – TOTOLINK T6 4.1.5cu.748_B20211015

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Summary

CVE-2026-51725 is an improper/incorrect access control vulnerability in the NTPSyncWithHost function of the TOTOLINK T6 router web management interface, firmware version 4.1.5cu.748_B20211015. The function fails to enforce authentication, allowing an unauthenticated network attacker to send a crafted request to change the device’s system clock. The issue carries a CVSS score of 9.1 (Critical).

Technical details

  • Root cause: The NTPSyncWithHost function, reachable through the router’s CGI-based management interface, does not verify that the caller is an authenticated administrator before acting on the request.
  • Trigger condition: An attacker sends a crafted HTTP POST request to the /cgi-bin/cstecgi.cgi endpoint invoking the NTPSyncWithHost action.
  • Attack vector: Network — no authentication or user interaction is required; the endpoint is exposed via the device’s standard web management interface.
  • Impact: An unauthenticated attacker can alter the device’s system clock. Manipulating device time can undermine time-dependent security controls (e.g., certificate validation, session/token expiry, logging integrity) on the affected device.

Affected software

  • TOTOLINK T6 router, firmware version 4.1.5cu.748_B20211015.
  • No other firmware versions have been confirmed as affected in published sources at this time.

Severity

  • CVSS v3.1 Base Score: 9.1 (Critical)
  • Attack Vector: Network (AC/PR/UI/scope/impact metrics beyond AV have not been published in the CVE record as of this writing).

Mitigation and recommended actions

  • Immediate: No official patched firmware version has been published by TOTOLINK for this CVE as of this writing. Check the TOTOLINK support site for a firmware update for the T6 model and apply it as soon as one becomes available.
  • If no patch is available:
    • Disable remote/WAN-facing access to the router’s web management interface; restrict management access to trusted LAN clients only.
    • Place the device behind a firewall or VPN so /cgi-bin/cstecgi.cgi is not reachable from the internet.
    • Monitor for unexpected changes to device clock/time settings.
    • Given that TOTOLINK T6 and related legacy models have a pattern of unpatched access-control issues, consider replacing end-of-life devices that no longer receive vendor firmware updates.

References

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