EUVD-2026-68641
GHSA-353h-xwqv-hhjw
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Unauthenticated network POST to an unguarded CGI handler (PR:N/AC:L); integrity and availability high since Wi-Fi config is rewritten/disruptable, confidentiality only low as the flaw reconfigures rather than reads data.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
5DescriptionCVE.org
Incorrect access control in the setWiFiBasicCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to reconfigure primary Wi-Fi settings via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
AnalysisAI
Unauthenticated Wi-Fi reconfiguration in the TOTOLINK T6 router (firmware 4.1.5cu.748_B20211015) lets remote attackers rewrite primary wireless settings by POSTing to the setWiFiBasicCfg handler of /cgi-bin/cstecgi.cgi without any credentials. The CGI endpoint fails to enforce access control (CWE-284), so an attacker on a routable path to the device can change SSID/security parameters and hijack or disrupt the wireless network. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network reachability to the TOTOLINK T6's web management endpoint /cgi-bin/cstecgi.cgi and the ability to send a POST invoking the setWiFiBasicCfg function; per the CVSS vector (PR:N/UI:N) no credentials and no user interaction are needed, matching the description's 'unauthenticated attackers.' The concrete prerequisite is simply HTTP access to that CGI dispatcher on the affected firmware build 4.1.5cu.748_B20211015. … 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/S:U/C:H/I:H/A:H, base 9.8) describes a network-reachable, low-complexity, unauthenticated attack - the classic worst-case profile for an embedded device. … 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 version is identified in the input data at time of analysis, and the references point to the TOTOLINK download portal and researcher coordination pages rather than a specific fixed firmware build; check the TOTOLINK T6 download page (https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/190/ids/36.html) for a firmware release newer than 4.1.5cu.748_B20211015 and apply it once available. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: complete inventory of all TOTOLINK T6 routers in production, confirm affected firmware versions (4.1.5cu.748_B20211015 and similar builds), and map network topology to identify exposure scope. …
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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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