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CVE-2026-51700 – Unauthenticated Wi-Fi Configuration Tampering (Improper Access Control) – TOTOLINK

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Summary

CVE-2026-51700 is an improper access control vulnerability (CWE-284) in the setWiFiAdvancedCfg function of the TOTOLINK T6 router’s web management interface, firmware version 4.1.5cu.748_B20211015. The function fails to verify that the requester is authenticated before processing wireless configuration changes, allowing a remote, unauthenticated attacker to submit a crafted request that degrades wireless behavior. The flaw carries a CVSS v3.1 base score of 9.1 (Critical).

Technical details

  • Root cause: The setWiFiAdvancedCfg function, exposed via the device’s CGI handler, does not enforce authentication or session validation before applying wireless configuration changes.
  • Trigger condition: An attacker sends a crafted HTTP POST request to /cgi-bin/cstecgi.cgi invoking the setWiFiAdvancedCfg action.
  • Attack vector: Network-based, no authentication or user interaction required (AV:N, PR:N, UI:N).
  • Impact: Unauthenticated remote modification of wireless configuration, degrading wireless behavior on the device; the CVSS vector indicates high confidentiality and integrity impact with no 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: No official TOTOLINK firmware update addressing this CVE was identified at the time of this writing. Check TOTOLINK’s official download portal for a firmware release for the T6 model that supersedes 4.1.5cu.748_B20211015 and apply it as soon as it becomes available.
  • If no patch is available: Restrict access to the router’s web management interface (/cgi-bin/cstecgi.cgi) to trusted internal networks only; do not expose the management interface to the internet. Place the device behind a firewall/VPN, disable remote management, and monitor for unexpected POST requests to the CGI endpoint targeting wireless configuration functions.

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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How IONIX’s External Exposure Management Platform Detects and Validates
Zero-Days to Shrink MTTR

1

Map your entire attack surface (continously)

IONIX uses multi-factor discovery methods, including DNS analysis, certificate mapping, metadata inspection, and more, to automatically map every internet-facing asset across your environment. This includes cloud instances, third-party platforms, shadow IT, and even forgotten infrastructure that traditional tools miss.

2

Monitor for new CVEs

Dozens of threat intel feeds using agentic technology are continuously analyzed to detect the appearance of proof-of-concept code, exploit kits, and indicators of active targeting. IONIX goes further by applying AI to proactively evaluate whether emerging vulnerabilities are likely to be exploited, even before PoCs go public.

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.

5

Execute Exploit Validations

By combining context about software stack, versioning, exposure status, and reachability, IONIX ensures that only the right payloads are executed against the right assets, maximizing efficiency and minimizing risk.

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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  • Identification of potentially exposed assets to this CVE
  • Confirmation of verified exploitable assets
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