EUVD-2026-68586
GHSA-mjfm-jjc7-32ch
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Unauthenticated network access to an unprotected CGI setter (AV:N/AC:L/PR:N/UI:N); write-only upload/flash tampering yields I:H and A:H (possible bricking) but no data disclosure, so C:N.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
5DescriptionCVE.org
Incorrect access control in the setUploadSetting function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to manipulate the upload or flash workflow via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
AnalysisAI
Unauthenticated manipulation of the firmware upload/flash workflow in the TOTOLINK T6 router (firmware 4.1.5cu.748_B20211015) is possible by sending crafted POST requests to the setUploadSetting handler in /cgi-bin/cstecgi.cgi, which lacks any authentication or access-control check (CWE-284). Any attacker with network reachability to the web interface can alter upload/flash settings, potentially corrupting or hijacking a firmware update and rendering the device inoperable. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network access to the TOTOLINK T6 web interface (/cgi-bin/cstecgi.cgi) on firmware 4.1.5cu.748_B20211015 and the ability to send a POST request invoking the setUploadSetting function; per CVSS PR:N/UI:N no authentication or user interaction is needed against the default configuration. … 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 = 9.8) reflects trivial unauthenticated network reach, which is consistent with the description. … 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; the referenced TOTOLINK pages are the download/coordination pages, so check for a firmware release 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 TOTOLINK T6 routers and identify all devices running firmware 4.1.5cu.748_B20211015 or earlier; immediately apply firewall rules to restrict access to ports 80 and 443 to authorized management networks only and disable remote web access if enabled. …
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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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