What is the CVSS score of CVE-2026-51672?

CVE-2026-51672 has a CVSS 3.1 base score of 9.1 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N. EPSS exploitation probability: 0.2%.

Which versions of TOTOLINK T6 are affected by CVE-2026-51672?

TOTOLINK T6 routers running firmware 4.1.5cu.748_B20211015 are vulnerable to unauthenticated remote information disclosure that allows attackers to read router configuration data, including roaming…

How to fix or mitigate CVE-2026-51672?

Within 24 hours, inventory all TOTOLINK T6 routers across your network and confirm which are running the affected firmware version 4.1.5cu.748_B20211015. Within 7 days, implement firewall rules to restrict access to the router web interface (ports 80/443) and the vulnerable /cgi-bin/cstecgi.cgi endpoint to authorized management networks only; disable remote management access if not operationally required. Within 30 days, contact TOTOLINK for available firmware updates or firmware versions for the T6 model; if no patch is released, evaluate replacement with alternative router vendors that provide active security support, or maintain strict network segmentation and continuous access logging on the affected endpoints.

TOTOLINK T6 CVE-2026-51672

EUVD-2026-68535 CRITICAL

Improper Access Control (CWE-284)

2026-08-31 mitre

GHSA-494p-2hmj-hm68

Authentication Bypass

9.1

CVSS 3.1 · Vendor: mitre

Severity by source

Vendor (mitre) PRIMARY

9.1 CRITICAL

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

vuln.today AI

5.3 MEDIUM

Remote, unauthenticated, low-complexity access (AV:N/AC:L/PR:N/UI:N), but impact is limited to reading one roaming config flag, so C:L and I:N/A:N rather than the feed's C:H/I: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

High

Availability

None

Lifecycle Timeline

Metadata Corrected

Sep 01, 2026 - 13:40 vuln.today

tag: N A removed

Analysis Generated

Sep 01, 2026 - 13:25 vuln.today

CVSS changed

Sep 01, 2026 - 13:22 NVD

9.1 (CRITICAL)

CVE Published

Aug 31, 2026 - 00:00 cve.org

UNKNOWN (no severity yet)

CVE Published

Aug 31, 2026 - 00:00 cve.org

CRITICAL 9.1

DescriptionCVE.org

Incorrect access control in the getRoamingCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to obtain the roaming enablement flag via sending a crafted POST request to /cgi-bin/cstecgi.cgi.

AnalysisAI

Information disclosure in the TOTOLINK T6 router (firmware 4.1.5cu.748_B20211015) lets unauthenticated remote attackers read the device's roaming enablement flag by sending a crafted POST request to the getRoamingCfg handler at /cgi-bin/cstecgi.cgi. The flaw is an access-control failure (CWE-284) on a CGI endpoint that should require authentication, and it is reachable over the network with no user interaction. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

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Impact

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Access

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Vulnerability AssessmentAI

Exploitation	Exploitation requires network reachability to the router's HTTP management service and the ability to POST to the /cgi-bin/cstecgi.cgi endpoint invoking the getRoamingCfg function; no authentication, credentials, or user interaction are needed (CVSS PR:N/UI:N), and it works against the affected firmware in its normal state. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	The signals conflict and warrant scrutiny. … 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 fixed firmware version is identified in the provided data, so no exact patch version can be cited; check the TOTOLINK downloads page (https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/190/ids/36.html) for an updated build superseding 4.1.5cu.748_B20211015 and apply it once available. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, inventory all TOTOLINK T6 routers across your network and confirm which are running the affected firmware version 4.1.5cu.748_B20211015. …

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