EUVD-2026-68587
GHSA-2x6c-v7m7-w2w9
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Unauthenticated, low-complexity network POST with no user interaction; setWiFiGuestCfg is a write-only setter so integrity is High but there is no data-read (C:N) and no direct availability loss.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
5DescriptionCVE.org
Incorrect access control in the setWiFiGuestCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to establish or weaken guest wireless access via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
AnalysisAI
Missing authorization in the setWiFiGuestCfg handler of the TOTOLINK T6 router (firmware 4.1.5cu.748_B20211015) lets remote unauthenticated attackers create or weaken the guest wireless network by POSTing a crafted request to /cgi-bin/cstecgi.cgi. Because the setter applies configuration without any session or credential check, an attacker can stand up an open/weakly-secured guest SSID or downgrade guest isolation without ever authenticating. …
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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 management endpoint /cgi-bin/cstecgi.cgi on firmware 4.1.5cu.748_B20211015, and the ability to send a POST invoking the setWiFiGuestCfg function - no authentication, user interaction, or non-default configuration is needed (PR:N/UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The published CVSS 9.1 (AV:N/AC:L/PR:N/UI:N/C:H/I:H/A:N) captures the trivial, unauthenticated, network-reachable nature of the flaw, but the C:H (confidentiality-High) rating is overstated: setWiFiGuestCfg is a write-only configuration setter, so the direct impact is integrity (attacker alters guest-WiFi state), not bulk data disclosure - I reassess this closer to 7.5 with C:N/I:H. … 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 in the provided data at time of analysis, so track the TOTOLINK T6 download page (https://www.totolink.net/) and apply any firmware newer than 4.1.5cu.748_B20211015 once published. … 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 disable guest WiFi functionality if it is not actively required. …
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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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