What is the CVSS score of CVE-2026-51736?

CVE-2026-51736 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-2026-51736?

TOTOLINK T6 routers contain a critical access control flaw allowing unauthenticated remote attackers to delete system logs via crafted POST requests, with no public exploit identified at time of…

How to fix or mitigate CVE-2026-51736?

Immediately conduct a network inventory of all TOTOLINK T6 routers (firmware 4.1.5cu.748_B20211015) and map exposure to internet or untrusted networks. Within 24 hours, implement firewall rules to restrict all access to /cgi-bin/cstecgi.cgi from untrusted sources. Within 7 days, configure external syslog forwarding to an isolated, hardened syslog collector outside the affected router to preserve logs, and implement alerting for clearSyslog requests. Within 30 days, contact TOTOLINK to determine patch availability and update timeline; until patched, enforce network segmentation restricting management access to VPN-authenticated users only, maintain offline log backups with daily verification, and establish out-of-band monitoring for log integrity.

TOTOLINK T6 CVE-2026-51736

EUVD-2026-68750 CRITICAL

Improper Access Control (CWE-284)

2026-08-31 mitre

GHSA-qpcx-vj6v-x66f

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

Unauthenticated network request (AV:N/AC:L/PR:N/UI:N) that only erases logs - an audit-trail integrity impact (I:L), with no confidentiality or availability effect.

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

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 - 15:38 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 clearSyslog function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to erase system logs via sending a crafted POST request to /cgi-bin/cstecgi.cgi.

AnalysisAI

Unauthenticated log erasure in the TOTOLINK T6 router (firmware 4.1.5cu.748_B20211015) lets remote attackers wipe system logs by sending a crafted POST request to the clearSyslog handler at /cgi-bin/cstecgi.cgi, with no credentials required. The flaw is an incorrect-access-control (CWE-284) gap on an administrative maintenance function that should be privileged. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Execution

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Vulnerability AssessmentAI

Exploitation	Exploitation requires network reachability to the TOTOLINK T6 web management service and the ability to POST to the clearSyslog function at /cgi-bin/cstecgi.cgi; per the CVSS vector (AV:N/AC:L/PR:N/UI:N) no authentication, no user interaction, and no special configuration are needed against the affected firmware 4.1.5cu.748_B20211015. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	The input CVSS of 9.1 (AV:N/AC:L/PR:N/UI:N/C:H/I:H/A:N) rates this as critical, but the impact metrics look overstated for the described behavior: clearSyslog erases logs, which is an integrity/anti-forensics impact on the audit trail - it does not disclose data, so C:H is hard to justify. … 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 at time of analysis; the referenced TOTOLINK pages are the download/product portal rather than a specific fixed build, so monitor them for an update newer than 4.1.5cu.748_B20211015 and apply it once published. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Immediately conduct a network inventory of all TOTOLINK T6 routers (firmware 4.1.5cu.748_B20211015) and map exposure to internet or untrusted networks. …

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