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CVE-2026-51674 – Unauthenticated Device Reboot via Access Control Bypass – TOTOLINK T6 (Firmware 4.1

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Summary

CVE-2026-51674 is an incorrect access control vulnerability in the setScheduleCfg function of the /cgi-bin/cstecgi.cgi endpoint on TOTOLINK T6 routers running firmware 4.1.5cu.748_B20211015. The endpoint fails to enforce authentication, allowing a remote, unauthenticated attacker to configure forced device reboot tasks. The flaw carries a CVSS v3.1 base score of 9.8 (Critical).

Technical details

  • Root cause: the setScheduleCfg function reachable via /cgi-bin/cstecgi.cgi does not verify that the caller is authenticated before accepting configuration changes.
  • Trigger condition: an attacker sends a crafted HTTP POST request to /cgi-bin/cstecgi.cgi invoking the setScheduleCfg action (topicurl parameter) with scheduling parameters that configure a forced reboot task.
  • Attack vector: network-facing web management interface; no credentials or user interaction required.
  • Impact: attacker-controlled scheduling of device reboots, disrupting availability of the router and any dependent network services.

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: no patched firmware version has been identified in vendor or public disclosure sources as of this writing; check TOTOLINK’s official download portal for a build newer than 4.1.5cu.748_B20211015 for the T6 model and apply it once available.
  • If no patch is available: restrict access to the router’s web management interface (/cgi-bin/cstecgi.cgi) to trusted management networks only, disable remote/WAN-side administration, and place the device behind a firewall or VPN so the interface is not directly internet-exposed.
  • Monitor devices for unexpected reboot scheduling changes or unplanned reboots that could indicate exploitation.

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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Map your entire attack surface (continously)

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2

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Not all CVEs matter. IONIX filters vulnerabilities by asking attacker-centric questions: Can it be reached from the internet? Does it require authentication? Is it being exploited in the wild? This dramatically reduces noise and focuses teams on threats that can actually be weaponized.

4

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5

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6

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Results are routed through integrations with ticketing, SOAR, and SIEM tools. Issues are written in plain language, bundled into remediation clusters, and prioritized based on asset criticality, exploitability, and blast radius. This shortens mean time to remediation (MTTR) and empowers teams to act with confidence.

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