EUVD-2026-68540
GHSA-vx8f-r949-23c9
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Unauthenticated low-complexity network toggle of a config service warrants AV:N/AC:L/PR:N and I:H; described behavior gives no direct data read (C:N) and only possible service disruption (A:L).
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
4DescriptionCVE.org
Incorrect access control in the setUPnPCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to change UPnP service state via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
AnalysisAI
Unauthenticated UPnP service-state manipulation in the TOTOLINK T6 router (firmware 4.1.5cu.748_B20211015) lets remote attackers toggle the UPnP service by POSTing a crafted request to the /cgi-bin/cstecgi.cgi endpoint, because the setUPnPCfg handler enforces no access control (CWE-284). Any network-reachable attacker can enable UPnP without credentials, opening the door to attacker-controlled port mappings on the LAN. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network access to the router's HTTP management service and the ability to POST to the /cgi-bin/cstecgi.cgi endpoint invoking the setUPnPCfg function; no authentication, credentials, or user interaction are needed (PR:N/UI:N), and it works against the affected T6 firmware 4.1.5cu.748_B20211015. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N, score 9.1) signals trivial, unauthenticated, low-complexity network exploitation, which is credible for an unauthenticated CGI endpoint. … 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 at time of analysis - the references point to TOTOLINK's general site and firmware download page (https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/190/ids/36.html) rather than a specific fixed build, so check that page for a firmware newer than 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, conduct a complete inventory of all TOTOLINK T6 routers in your environment, identify firmware versions, and document network locations and business criticality. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
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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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