EUVD-2026-68585
GHSA-4wrw-r87c-p2q9
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Unauthenticated low-complexity network write to WAN config gives high integrity and availability (connectivity) impact, but a setter yields no direct confidentiality disclosure so C:N.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
5DescriptionCVE.org
Incorrect access control in the setWanCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to alter upstream provisioning and connectivity via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
AnalysisAI
Unauthenticated WAN configuration tampering in the TOTOLINK T6 router (firmware 4.1.5cu.748_B20211015) lets remote attackers alter upstream provisioning and connectivity by POSTing a crafted request to the setWanCfg handler of /cgi-bin/cstecgi.cgi, with no login required. The setWanCfg function performs no access-control check (CWE-284), so an attacker can rewrite WAN/uplink settings - potentially redirecting or severing the device's internet connectivity. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the ability to send an HTTP POST to /cgi-bin/cstecgi.cgi invoking the setWanCfg handler on a TOTOLINK T6 running firmware 4.1.5cu.748_B20211015; per CVSS PR:N/UI:N no authentication, credentials, or user interaction are needed. … 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:N, base 9.1) reflects a trivially reachable, unauthenticated network write. … 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; monitor the TOTOLINK download portal (https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/190/ids/36.html) and the vendor-coordination trackers for a build superseding 4.1.5cu.748_B20211015 and apply it once published. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, complete an inventory of all TOTOLINK T6 routers in production and document their firmware versions, prioritizing devices with internet-facing management access. …
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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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