What is the CVSS score of CVE-2026-51616?

CVE-2026-51616 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. EPSS exploitation probability: 0.2%.

Which versions of TOTOLINK T6 are affected by CVE-2026-51616?

TOTOLINK T6 routers running firmware 4.1.5cu.748_B20211015 allow remote attackers to extract network topology data (WAN, LAN, and DHCP configuration) without authentication, directly exposing…

How to fix or mitigate CVE-2026-51616?

Within 24 hours, inventory all TOTOLINK T6 routers and confirm firmware version; disable remote management access to the web interface or restrict it to specific trusted IP addresses using firewall ACLs, and isolate affected devices on a dedicated management VLAN if operationally feasible. Within 7 days, deploy network monitoring and alerting to detect abnormal attempts to access the management interface (HTTP/HTTPS ports on router IP addresses), document the scope of network data that may have been exposed to external parties, and verify that access controls are functioning as intended. Within 30 days, monitor the vendor's security advisories for a patched firmware release; upon availability, test the update in an isolated lab environment and deploy to all affected T6 routers according to a documented change control process; if no patch is released, maintain the network access controls indefinitely and evaluate long-term device replacement or end-of-life planning.

TOTOLINK T6 CVE-2026-51616

EUVD-2026-67910 HIGH

Improper Access Control (CWE-284)

2026-08-28 mitre

GHSA-qmpv-w8qw-phj8

Authentication Bypass

7.5

CVSS 3.1 · Vendor: mitre

Severity by source

Vendor (mitre) PRIMARY

7.5 HIGH

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

vuln.today AI

5.3 MEDIUM

LAN addressing and DHCP config are reconnaissance-grade data, not credentials or keys, making C:L more accurate than the provided C:H; all other metrics align with the description.

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

None

Availability

None

Lifecycle Timeline

Metadata Corrected

Sep 01, 2026 - 19:40 vuln.today

tag: N A removed

Analysis Generated

Sep 01, 2026 - 19:34 vuln.today

CVSS changed

Sep 01, 2026 - 17:22 NVD

7.5 (HIGH)

CVE Published

Aug 28, 2026 - 00:00 cve.org

HIGH 7.5

CVE Published

Aug 28, 2026 - 00:00 cve.org

UNKNOWN (no severity yet)

DescriptionCVE.org

Incorrect access control in the getWanIeCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to obtain LAN addressing and DHCP configuration information via sending a crafted POST request to /cgi-bin/cstecgi.cgi.

AnalysisAI

Unauthenticated information disclosure in TOTOLINK T6 firmware 4.1.5cu.748_B20211015 exposes WAN interface, LAN addressing, and DHCP configuration to any network-reachable attacker without credentials. The getWanIeCfg CGI function accepts POST requests at /cgi-bin/cstecgi.cgi without enforcing access control, returning network topology data that can directly support further reconnaissance or targeted attacks. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

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Exploit

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Execution

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Impact

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Vulnerability AssessmentAI

Exploitation	The attacker must be able to reach the router's HTTP management interface, which is accessible from any device on the LAN by default on firmware 4.1.5cu.748_B20211015. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	The CVSS 3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N) correctly captures the zero-barrier access path, but the C:H rating appears overstated relative to what is actually leaked - LAN addressing and DHCP configuration are reconnaissance-grade data, not authentication credentials, encryption keys, or session material, which would more clearly justify a High confidentiality rating. … 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	Consult the TOTOLINK firmware download page at https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/190/ids/36.html for an updated firmware release addressing the authentication gap in getWanIeCfg; no specific patched firmware version has been confirmed in the available data, and patch status should be verified directly with the vendor. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, inventory all TOTOLINK T6 routers and confirm firmware version; disable remote management access to the web interface or restrict it to specific trusted IP addresses using firewall ACLs, and isolate affected devices on a dedicated management VLAN if operationally feasible. …

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