EUVD-2026-68584
GHSA-68j6-9q5v-hxhw
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Unauthenticated network POST to the CGI upgrade handler (AV:N/AC:L/PR:N/UI:N); tampering with the firmware-upgrade workflow yields high integrity and availability (brick) impact, no data read (C:N).
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
5DescriptionCVE.org
Incorrect access control in the setUpgradeFW function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to trigger firmware-upgrade workflow changes via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
AnalysisAI
Improper access control in the setUpgradeFW function of the TOTOLINK T6 router (firmware 4.1.5cu.748_B20211015) lets unauthenticated remote attackers alter the firmware-upgrade workflow by sending a crafted POST request to /cgi-bin/cstecgi.cgi. Because the CGI endpoint enforces no authentication, an attacker on a reachable network can tamper with the device's firmware update process, risking integrity compromise and denial of service (bricking). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network reachability to the TOTOLINK T6 management web server and the ability to send a POST request to /cgi-bin/cstecgi.cgi invoking the setUpgradeFW handler; no authentication, credentials, or user interaction are needed (PR:N/UI:N). … 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:N/I:H/A:H = 9.1) describes a network-reachable, low-complexity, unauthenticated flaw with high integrity and availability impact and no confidentiality impact - consistent with tampering with a firmware-upgrade routine rather than reading data. … 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 fixed firmware version is identified in the available data, so no exact patch version can be cited - monitor the TOTOLINK download portal (https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/190/ids/36.html) for an update superseding 4.1.5cu.748_B20211015. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all TOTOLINK T6 routers in your organization and confirm installed firmware versions against 4.1.5cu.748_B20211015. …
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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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