What is the CVSS score of CVE-2026-51705?

CVE-2026-51705 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.2%.

Which versions of TOTOLINK T6 are affected by CVE-2026-51705?

TOTOLINK T6 routers (firmware 4.1.5cu.748_B20211015) allow unauthenticated remote attackers to rename mesh network identifiers through an unprotected web interface.

How to fix or mitigate CVE-2026-51705?

Within 24 hours: identify and inventory all TOTOLINK T6 routers in your environment and document their network exposure. Within 7 days: if devices are exposed to untrusted networks, implement firewall rules to restrict access to the web management interface (port 80/443, /cgi-bin/cstecgi.cgi) to administrative networks only, or disable remote management if feasible. Within 30 days: monitor TOTOLINK vendor security advisories for an available patch to firmware 4.1.5cu.748_B20211015 or later, and plan deployment testing in a controlled environment prior to production rollout.

TOTOLINK T6 CVE-2026-51705

EUVD-2026-68644 CRITICAL

Improper Access Control (CWE-284)

2026-08-31 mitre

GHSA-v239-2h64-5xhw

Authentication Bypass TOTOLINK

9.8

CVSS 3.1 · Vendor: mitre

Severity by source

Vendor (mitre) PRIMARY

9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

vuln.today AI

5.3 MEDIUM

Unauthenticated LAN-reachable setter (AV:N/AC:L/PR:N/UI:N), but renaming a mesh entry is a limited integrity change with no confidentiality or availability impact.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (mitre).

CVSS VectorVendor: mitre

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Metadata Corrected

Sep 02, 2026 - 19:40 vuln.today

tag: N A replaced by TOTOLINK

Analysis Generated

Sep 02, 2026 - 19:23 vuln.today

CVSS changed

Sep 02, 2026 - 19:22 NVD

9.8 (CRITICAL)

CVE Published

Aug 31, 2026 - 00:00 cve.org

CRITICAL 9.8

CVE Published

Aug 31, 2026 - 00:00 cve.org

UNKNOWN (no severity yet)

DescriptionCVE.org

Incorrect access control in the setWiFiMeshName function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to rename mesh entries via sending a crafted POST request to /cgi-bin/cstecgi.cgi.

AnalysisAI

Unauthenticated configuration tampering in the TOTOLINK T6 router (firmware 4.1.5cu.748_B20211015) lets remote attackers invoke the setWiFiMeshName handler via a crafted POST to /cgi-bin/cstecgi.cgi with no credentials, renaming mesh network entries. The setter enforces no access control (CWE-284), so any host that can reach the web management interface can alter mesh labels. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation	Exploitation requires network reachability to the TOTOLINK T6 web management endpoint /cgi-bin/cstecgi.cgi on firmware 4.1.5cu.748_B20211015 and the ability to send a crafted POST invoking the setWiFiMeshName function; no authentication, credentials, or user interaction are needed (PR:N/UI:N). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	The published CVSS 9.8 (AV:N/AC:L/PR:N/UI:N/C:H/I:H/A:H) overstates real-world impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation	No vendor-released patched firmware version is identified at time of analysis; the referenced TOTOLINK pages are product/download portals rather than a versioned fix advisory, so monitor totolink.net for updated T6 firmware and apply it once published. … Detailed patch versions, workarounds, and compensating controls in full report.