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CVE-2026-51713 – Unauthenticated WAN Configuration Manipulation – TOTOLINK T6 4.1.5cu.748_B20211015

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Summary

CVE-2026-51713 is an incorrect access control vulnerability (CWE-284) in the setManualDialCfg function of the TOTOLINK T6 router running firmware 4.1.5cu.748_B20211015. The flaw allows an unauthenticated remote attacker to manipulate the device’s WAN dial configuration by sending a crafted HTTP POST request to the router’s CGI management interface. The issue carries a CVSS v3.1 base score of 9.1 (Critical).

Technical details

  • Root cause: the setManualDialCfg handler in /cgi-bin/cstecgi.cgi does not enforce authentication or authorization checks before processing requests.
  • Trigger condition: an attacker sends a crafted POST request to /cgi-bin/cstecgi.cgi with topicurl=setManualDialCfg and manual-dial parameters.
  • Attack vector: network-based, no privileges or user interaction required (AV:N/AC:L/PR:N/UI:N).
  • Impact: unauthenticated manipulation of the router’s WAN dial state, with high confidentiality and integrity impact and no availability impact per the CVSS vector.

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 patch has been confirmed publicly for this specific version at time of writing; check the TOTOLINK support site for firmware updates for the T6 model and apply the latest available release.
  • If no patch is available: restrict access to the router’s web management interface to trusted networks only, disable remote/WAN-side administration, and place management interfaces behind a VPN or firewall ACL rather than exposing them directly to the internet.

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<version>), TOTOLINK

References

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Map your entire attack surface (continously)

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Identify Potential External Exposures

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

Create Safe, Scalable Exploit Validations

IONIX transforms real-world PoCs into safe, non-intrusive test payloads that can be run in production environments without disruption. These simulations are precisely targeted to the systems that are vulnerable, ensuring rapid validation without unnecessary load.

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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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