EUVD-2026-67904
GHSA-j65q-2cwp-c6px
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Unauthenticated network read of WAN config gives C:H; description shows disclosure only with no modification or DoS, so I:N/A:N (not the vendor's I:H).
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
5DescriptionCVE.org
Incorrect access control in the getWanCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to obtain WAN configuration data via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
AnalysisAI
Information disclosure in the TOTOLINK T6 router (firmware 4.1.5cu.748_B20211015) lets remote unauthenticated attackers retrieve WAN configuration data by sending a crafted POST request to the getWanCfg handler at /cgi-bin/cstecgi.cgi. The getWanCfg function fails to enforce access control, so no credentials are required to read WAN settings (which can include ISP connection details, PPPoE usernames/passwords, and IP configuration). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network reachability to the TOTOLINK T6 web service on /cgi-bin/cstecgi.cgi and the ability to send a POST request invoking the getWanCfg function; no authentication, credentials, or user interaction are needed (CVSS PR:N/UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor CVSS of 9.1 (AV:N/AC:L/PR:N/UI:N/C:H/I:H/A:N) rates this Critical, but the impact metrics appear overstated: the description states only that WAN configuration data can be *obtained* (a read/disclosure), which supports C:H but not I:H - there is no indication of a write/modification primitive, so a more defensible assessment is C:H/I:N/A:N (base 7.5, High). … 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 identified at time of analysis; no fixed firmware version is listed in the provided data, so a specific upgrade target cannot be cited. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all TOTOLINK T6 routers running firmware 4.1.5cu.748_B20211015 and restrict external access to the /cgi-bin/cstecgi.cgi endpoint via firewall policies or network segmentation. …
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Same weakness CWE-284 – Improper Access Control
View allSame technique Authentication Bypass
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External POC / Exploit Code
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