What is the CVSS score of EUVD-2026-68531?

EUVD-2026-68531 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:N/I:H/A:N. EPSS exploitation probability: 0.2%.

Which versions of TOTOLINK T6 are affected by EUVD-2026-68531?

TOTOLINK T6 routers running firmware version 4.1.5cu.748_B20211015 contain an unauthenticated access control vulnerability allowing any network-connected attacker to modify device configuration…

How to fix or mitigate EUVD-2026-68531?

Within 24 hours, audit your network inventory to identify all TOTOLINK T6 routers running firmware version 4.1.5cu.748_B20211015. Within 7 days, immediately restrict access to the device management interface (HTTP/HTTPS ports) using firewall rules or network segmentation to authorized administrative networks only, and disable remote management if not operationally required. Within 30 days, establish a monitoring process for TOTOLINK security advisories to track patch availability and create an upgrade timeline for all affected devices, as no vendor patch currently exists.

TOTOLINK T6 EUVD-2026-68531

| CVE-2026-51668 HIGH

Improper Access Control (CWE-284)

2026-08-31 mitre

GHSA-93x7-hmfr-7pxq

Authentication Bypass N A

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:N/I:H/A:N

vuln.today AI

5.3 MEDIUM

Integrity impact is Low rather than High because only a cosmetic language configuration parameter is modifiable, not security-critical settings; all other metrics match the provided vector.

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

None

Integrity

High

Availability

None

Lifecycle Timeline

Analysis Generated

Sep 01, 2026 - 13:24 vuln.today

CVSS changed

Sep 01, 2026 - 13:22 NVD

7.5 (HIGH)

CVE Published

Aug 31, 2026 - 00:00 cve.org

UNKNOWN (no severity yet)

CVE Published

Aug 31, 2026 - 00:00 cve.org

HIGH 7.5

DescriptionCVE.org

Incorrect access control in the setLanguageCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to modify language configuration via sending a crafted POST request to /cgi-bin/cstecgi.cgi.

AnalysisAI

Unauthenticated configuration modification in TOTOLINK T6 firmware 4.1.5cu.748_B20211015 allows any network-reachable attacker to alter the device's language setting by sending a crafted HTTP POST request to /cgi-bin/cstecgi.cgi without supplying credentials. The setLanguageCfg function performs no access control check before processing the request (CWE-284), meaning the endpoint is open to any host that can reach the management interface. …

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Vulnerability AssessmentAI

Exploitation	No authentication and no special device configuration are required beyond network reachability to the TOTOLINK T6 web management interface on its HTTP management port. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	The CVSS 7.5 High rating reflects the unauthenticated network attack vector (AV:N/AC:L/PR:N/UI:N), which is technically accurate - no credentials or user interaction are required. … 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 with a confirmed fixed firmware version has been identified in the available reference data at time of analysis. … Detailed patch versions, workarounds, and compensating controls in full report.