EUVD-2026-68671
GHSA-p3pg-hj3g-7395
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Unauthenticated network POST (AV:N/AC:L/PR:N/UI:N) but the action only deletes QoS config, so C:N and integrity/availability are limited (I:L/A:L), not the input's C:H/I:H/A:H.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
5DescriptionCVE.org
Incorrect access control in the delSmartQosCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to remove Smart QoS rules via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
AnalysisAI
Unauthenticated configuration tampering in the TOTOLINK T6 router (firmware 4.1.5cu.748_B20211015) lets remote attackers delete Smart QoS rules by sending a crafted POST request to the delSmartQosCfg handler at /cgi-bin/cstecgi.cgi. The endpoint performs no access-control check, so any attacker able to reach the device's web interface can remove QoS configuration without credentials. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network reachability to the TOTOLINK T6's web management endpoint /cgi-bin/cstecgi.cgi and the ability to send a POST request invoking the delSmartQosCfg function; per the CVSS vector (PR:N/UI:N) no authentication and no user interaction are needed, and it works against the default firmware 4.1.5cu.748_B20211015. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The published CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, 9.8) rates this Critical on the strength of unauthenticated network reachability, but the C:H/I:H/A:H impact appears inflated relative to the described behavior: deleting Smart QoS rules is a configuration-integrity and availability concern, not a confidentiality breach, so the true impact is narrower than a full-system compromise. … 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 available data, so no exact fix 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 updated firmware image for the T6 and apply it once published. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all TOTOLINK T6 routers (firmware 4.1.5cu.748_B20211015) in your environment and immediately restrict management interface access to authenticated internal networks-remove any internet-facing exposure. …
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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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