What is the CVSS score of CVE-2026-51683?

CVE-2026-51683 has a CVSS 3.1 base score of 4.3 (Medium). CVSS vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N. EPSS exploitation probability: 0.2%.

TOTOLINK T6 CVE-2026-51683

EUVD-2026-68579 MEDIUM

Improper Access Control (CWE-284)

2026-08-31 mitre

GHSA-mv58-mpg3-3mmp

Authentication Bypass

4.3

CVSS 3.1 · Vendor: mitre

Severity by source

Vendor (mitre) PRIMARY

4.3 MEDIUM

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

vuln.today AI

5.4 MEDIUM

Adjacent-network unauthenticated write to LAN config; A:L added because altering LAN settings can disrupt connectivity for all network clients.

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

4.0 AV:A/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

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Lifecycle Timeline

Metadata Corrected

Sep 01, 2026 - 17:40 vuln.today

tag: N A removed

Analysis Generated

Sep 01, 2026 - 17:38 vuln.today

CVSS changed

Sep 01, 2026 - 17:22 NVD

4.3 (MEDIUM)

CVE Published

Aug 31, 2026 - 00:00 cve.org

UNKNOWN (no severity yet)

DescriptionCVE.org

Incorrect access control in the setLanCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to alter LAN network configuration via sending a crafted POST request to /cgi-bin/cstecgi.cgi.

AnalysisAI

Unauthenticated LAN configuration tampering in TOTOLINK T6 firmware 4.1.5cu.748_B20211015 allows any attacker on the adjacent network to modify the router's LAN settings by sending a crafted POST request to /cgi-bin/cstecgi.cgi targeting the setLanCfg handler, which lacks access control enforcement. The attack requires only adjacent network positioning - no credentials, no user interaction - and can alter LAN network parameters such as IP addressing, subnet masks, or gateway settings. …

Unlock full vulnerability intelligence

Risk assessment & exploitation conditions
Attack chain visualization
Remediation with exact patch versions
Threat intelligence from 22 sources
Personal watchlist & email alerts

Continue with Google Continue with GitHub

Free forever · No credit card required

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

technique details hidden

Delivery

technique details hidden

Exploit

technique details hidden

Execution

technique details hidden

Impact

technique details hidden

Access

technique details hidden

Delivery

technique details hidden

Exploit

technique details hidden

Execution

technique details hidden

Impact

technique details hidden

Vulnerability AssessmentAI

Exploitation	The attacker must be positioned on the same Layer 2 network segment as the router's LAN interface - either connected via Ethernet to a LAN port or associated with the router's Wi-Fi network. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	The provided CVSS score of 4.3 (AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N) accurately captures the bounded scope of this vulnerability. … 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	Check the TOTOLINK firmware download page (https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/190/ids/36.html) for an updated firmware release addressing this issue; no specific patched version number has been confirmed in the available data, so Patch status is: no vendor-released patch independently confirmed at time of analysis. … Detailed patch versions, workarounds, and compensating controls in full report.