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CVE-2026-51669 – Unauthenticated Information Disclosure – TOTOLINK T6 4.1.5cu.748_B20211015

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Summary

CVE-2026-51669 is an incorrect access control vulnerability (CWE-284) in the getPairCfg function of TOTOLINK T6 router firmware version 4.1.5cu.748_B20211015. An unauthenticated remote attacker can send a crafted POST request to the device’s CGI endpoint to retrieve pairing and mesh-slave configuration data. The flaw carries a CVSS v3.1 base score of 9.1 (Critical).

Technical details

  • Root cause: The getPairCfg function does not enforce authentication or authorization checks before returning device pairing/mesh-slave configuration data.
  • Trigger condition: Sending a crafted HTTP POST request to /cgi-bin/cstecgi.cgi requesting the getPairCfg action.
  • Attack vector: Network-based, no authentication or user interaction required (AV:N, PR:N, UI:N, AC:L).
  • Impact: Disclosure of mesh/pairing configuration data (high confidentiality and integrity impact per the CVSS vector); no availability impact is reported.

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 patched firmware version has been identified in the public CVE record at the time of writing. Check the TOTOLINK support/download portal for an updated firmware build for the T6 model and apply it as soon as one is released.
  • 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 administration, and place the device behind a firewall or VPN so the CGI endpoint is not directly internet-exposed.

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

References

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1

Map your entire attack surface (continously)

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2

Monitor for new CVEs

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3

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

Drive Fast and Actionable Remediation

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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