What is the CVSS score of CVE-2026-51733?

CVE-2026-51733 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.2%.

Which versions of TOTOLINK T6 are affected by CVE-2026-51733?

TOTOLINK T6 router firmware contains an unauthenticated remote configuration tampering vulnerability allowing attackers to delete Wi-Fi schedule entries without authentication, affecting any…

How to fix or mitigate CVE-2026-51733?

Within 24 hours, inventory all TOTOLINK T6 routers in use and confirm firmware version (4.1.5cu.748_B20211015 and earlier are affected). Within 7 days, check TOTOLINK's security advisories for available firmware updates; if unavailable, implement network-level controls by restricting access to the router's management interface (/cgi-bin/cstecgi.cgi endpoint) to trusted administrative networks only and disable remote management if enabled. Within 30 days, establish a vendor communication protocol to track security updates, and evaluate replacing TOTOLINK T6 units with routers from vendors demonstrating active security patch cadence.

TOTOLINK T6 CVE-2026-51733

EUVD-2026-68753 CRITICAL

Improper Access Control (CWE-284)

2026-08-31 mitre

GHSA-qm9f-xm73-7q54

Authentication Bypass TOTOLINK

9.8

CVSS 3.1 · Vendor: mitre

Severity by source

Vendor (mitre) PRIMARY

9.8 CRITICAL

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

vuln.today AI

6.5 MEDIUM

Unauthenticated network POST with no interaction (AV:N/AC:L/PR:N/UI:N); effect is deletion of Wi-Fi schedule config only, so C:N and low integrity/availability (I:L/A:L), not the overstated C:H/I:H/A:H.

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

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

High

Lifecycle Timeline

Metadata Corrected

Sep 02, 2026 - 16:40 vuln.today

tag: N A replaced by TOTOLINK

Analysis Generated

Sep 02, 2026 - 16:30 vuln.today

CVSS changed

Sep 02, 2026 - 16:22 NVD

9.8 (CRITICAL)

CVE Published

Aug 31, 2026 - 00:00 cve.org

CRITICAL 9.8

CVE Published

Aug 31, 2026 - 00:00 cve.org

UNKNOWN (no severity yet)

DescriptionCVE.org

Incorrect access control in the FirmwareUpgrade function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to remove Wi-Fi schedule entries via sending a crafted POST request to /cgi-bin/cstecgi.cgi.

AnalysisAI

Unauthenticated configuration tampering in TOTOLINK T6 router firmware 4.1.5cu.748_B20211015 lets remote attackers delete Wi-Fi schedule entries by sending a crafted POST request to the /cgi-bin/cstecgi.cgi endpoint. The affected handler (labeled 'FirmwareUpgrade' in the advisory, though the observed effect is removal of Wi-Fi schedule rules) performs no access-control check. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation	Exploitation requires network access to the TOTOLINK T6 (firmware 4.1.5cu.748_B20211015) web management service and the ability to POST to /cgi-bin/cstecgi.cgi invoking the affected handler; no authentication, credentials, or user interaction are needed (PR:N/UI:N). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	The provided CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N, C:H/I:H/A:H = 9.8) captures the unauthenticated, low-complexity network reachability accurately, but the C:H/I:H/A:H impact set is overstated for the described behavior: deleting Wi-Fi schedule entries is a write/state-change with no data disclosure, so a more defensible impact is C:N/I:L/A:L. … 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 patched firmware version is identified in the available data; check the TOTOLINK download portal (https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/190/ids/36.html) for a build newer than 4.1.5cu.748_B20211015 and apply it once published. … Detailed patch versions, workarounds, and compensating controls in full report.