What is the CVSS score of CVE-2026-51641?

CVE-2026-51641 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. EPSS exploitation probability: 0.2%.

Which versions of TOTOLINK T6 are affected by CVE-2026-51641?

TOTOLINK T6 routers running firmware 4.1.5cu.748_B20211015 expose mesh network topology and configuration to unauthenticated attackers, enabling network reconnaissance.

How to fix or mitigate CVE-2026-51641?

Within 24 hours: inventory all TOTOLINK T6 devices running firmware 4.1.5cu.748_B20211015 and restrict management interface access to authorized administrative networks only using firewall rules. Within 7 days: implement network segmentation to prevent guest or untrusted networks from reaching the management interface; enable logging and deploy network monitoring for access attempts to /cgi-bin/cstecgi.cgi. Within 30 days: monitor TOTOLINK security advisories for patched firmware versions and develop a hardware replacement plan if no patched firmware becomes available.

TOTOLINK T6 CVE-2026-51641

EUVD-2026-67925 HIGH

Improper Access Control (CWE-284)

2026-08-28 mitre

GHSA-674f-prpq-5p64

Authentication Bypass TOTOLINK

7.5

CVSS 3.1 · Vendor: mitre

Severity by source

Vendor (mitre) PRIMARY

7.5 HIGH

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

vuln.today AI

7.5 HIGH

Network-accessible unauthenticated endpoint; no credentials required; impact is read-only confidentiality disclosure with no integrity or availability consequence.

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

4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/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

None

Availability

None

Lifecycle Timeline

Metadata Corrected

Sep 01, 2026 - 17:40 vuln.today

tag: N A replaced by TOTOLINK

Analysis Generated

Sep 01, 2026 - 17:28 vuln.today

CVSS changed

Sep 01, 2026 - 17:22 NVD

7.5 (None) 7.5 (HIGH)

CVE Published

Aug 28, 2026 - 00:00 cve.org

UNKNOWN (no severity yet)

CVE Published

Aug 28, 2026 - 00:00 cve.org

HIGH 7.5

DescriptionCVE.org

Incorrect access control in the getWiFiMeshConfig function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to obtain mesh configuration and runtime state information via sending a crafted POST request to /cgi-bin/cstecgi.cgi.

AnalysisAI

Unauthenticated access to the getWiFiMeshConfig endpoint on TOTOLINK T6 firmware 4.1.5cu.748_B20211015 exposes mesh network configuration and runtime state to any attacker reachable over the management interface. The CGI handler at /cgi-bin/cstecgi.cgi fails to enforce authentication before executing getWiFiMeshConfig, returning sensitive mesh topology data in response to a single crafted POST request with no credentials. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation	Network-level reachability to the TOTOLINK T6 HTTP management interface is the sole prerequisite. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	The CVSS 3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N) reflects genuine ease of exploitation: network-accessible with no credentials, no complexity, and no user interaction. … 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 patch has been identified at time of analysis. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours: inventory all TOTOLINK T6 devices running firmware 4.1.5cu.748_B20211015 and restrict management interface access to authorized administrative networks only using firewall rules. …

Threat intelligence, references, and detailed analysis are available after sign-in.