What is the CVSS score of CVE-2026-51729?

CVE-2026-51729 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-2026-51729?

TOTOLINK T6 routers (firmware 4.1.5cu.748_B20211015 and related versions) are vulnerable to unauthenticated remote device deletion, enabling attackers to remove managed slave devices and disrupt…

How to fix or mitigate CVE-2026-51729?

Within 24 hours, inventory all TOTOLINK T6 routers in production, document firmware versions and current managed device lists, and establish real-time alerting for unexpected device deletion activity. Within 7 days, restrict management interface access to trusted administrative networks only, disable remote management capabilities where operationally feasible, and contact TOTOLINK support directly to confirm available patched firmware versions for firmware line 4.1.5cu.748. Within 30 days, implement network segmentation isolating router management interfaces from untrusted traffic, deploy continuous monitoring of delDevice function calls, and develop a device replacement or migration plan with a 90-day target date if TOTOLINK does not release a security patch.

TOTOLINK T6 CVE-2026-51729

EUVD-2026-68712 CRITICAL

Improper Access Control (CWE-284)

2026-08-31 mitre

GHSA-2j8w-jrrx-p4hr

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

8.2 HIGH

Unauthenticated single request (AV:N/AC:L/PR:N/UI:N); deletion is an integrity write (I:H) reducing the removed device's availability (A:L); no data disclosure so C:N, diverging from the input's C:H.

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

4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:L/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 - 15:40 vuln.today

tag: N A removed

Analysis Generated

Sep 01, 2026 - 15:37 vuln.today

CVSS changed

Sep 01, 2026 - 15:22 NVD

9.1 (CRITICAL)

CVE Published

Aug 31, 2026 - 00:00 cve.org

CRITICAL 9.1

CVE Published

Aug 31, 2026 - 00:00 cve.org

UNKNOWN (no severity yet)

DescriptionCVE.org

Incorrect access control in the delDevice function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to request deletion of a managed slave device via sending a crafted POST request to /cgi-bin/cstecgi.cgi.

AnalysisAI

Unauthenticated device deletion in the TOTOLINK T6 router (firmware 4.1.5cu.748_B20211015) lets remote attackers remove any managed slave device by sending a crafted POST request to /cgi-bin/cstecgi.cgi. The delDevice function fails to enforce access control (CWE-284), so no credentials are needed. …

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Attack ChainAIDerived

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Vulnerability AssessmentAI

Exploitation	Exploitation requires network reachability to the TOTOLINK T6 web management endpoint /cgi-bin/cstecgi.cgi and the ability to send a POST request invoking the delDevice function; no authentication, credentials, or user interaction are required (AV:N/AC:L/PR:N/UI:N). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	Signals conflict. … 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 version is identified at time of analysis; monitor TOTOLINK's firmware download page (https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/190/ids/36.html) and the NVD entry (https://nvd.nist.gov/vuln/detail/CVE-2026-51729) for an updated firmware image and apply it once released. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, inventory all TOTOLINK T6 routers in production, document firmware versions and current managed device lists, and establish real-time alerting for unexpected device deletion activity. …

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