What is the CVSS score of EUVD-2026-67907?

EUVD-2026-67907 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 EUVD-2026-67907?

TOTOLINK T6 router firmware version 4.1.5cu.748_B20211015 contains an unauthenticated device enumeration vulnerability allowing remote attackers to discover which devices are currently connected to…

How to fix or mitigate EUVD-2026-67907?

Within 24 hours, identify all TOTOLINK T6 routers in production and confirm firmware version using device inventory; immediately restrict HTTP/HTTPS access to the management interface (ports 80/443) to trusted administrative networks only via firewall rules. Within 7 days, implement network segmentation isolating router management traffic, disable remote management access if enabled, and configure HTTP access logging to detect POST requests to /cgi-bin/cstecgi.cgi with getOnlineClient parameters. Within 30 days, contact TOTOLINK support to confirm patch release timeline; if no patch is released within 90 days, evaluate router replacement with a vendor demonstrating timely security updates.

TOTOLINK T6 EUVD-2026-67907

| CVE-2026-51619 HIGH

Improper Access Control (CWE-284)

2026-08-28 mitre

GHSA-q4r7-ff4v-586q

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

5.3 MEDIUM

getOnlineClient returns client inventory (MACs, IPs, hostnames), not credentials or config secrets, so C:L more accurately reflects the actual disclosure scope than C:H.

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

4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/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 - 17:37 vuln.today

CVSS changed

Sep 01, 2026 - 17:22 NVD

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 getOnlineClient function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to obtain online client information via sending a crafted POST request to /cgi-bin/cstecgi.cgi.

AnalysisAI

Unauthenticated online client enumeration in TOTOLINK T6 firmware 4.1.5cu.748_B20211015 exposes connected device information to any attacker who can reach the router's HTTP management interface. The getOnlineClient function within the /cgi-bin/cstecgi.cgi CGI dispatcher applies no access control, so a crafted POST request returns the router's live client inventory without credentials. …

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Attack ChainAIDerived

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Vulnerability AssessmentAI

Exploitation	No authentication is required - the CVSS PR:N metric confirms this. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	The NVD-assigned CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N, score 7.5) assigns high confidentiality impact, which likely overstates real-world harm. … 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 independently confirmed for this vulnerability at time of analysis. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, identify all TOTOLINK T6 routers in production and confirm firmware version using device inventory; immediately restrict HTTP/HTTPS access to the management interface (ports 80/443) to trusted administrative networks only via firewall rules. …

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