EUVD-2026-68643
GHSA-4c46-93x9-557q
Severity by source
AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
AV:A confirmed by adjacency-only reachability; PR:N matches unauthenticated access; A:L reflects partial QoS degradation with no C or I impact.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
4DescriptionCVE.org
Incorrect access control in the setSmartQosCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to degrade traffic handling via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
AnalysisAI
Incorrect access control in the setSmartQosCfg function of TOTOLINK T6 firmware 4.1.5cu.748_B20211015 permits unauthenticated adjacent-network attackers to overwrite QoS traffic-shaping configuration via a crafted POST to /cgi-bin/cstecgi.cgi, intentionally degrading traffic handling for legitimate network users. The attack requires no credentials and no user interaction, but is bounded to Layer 2 adjacency (LAN or Wi-Fi segment), preventing internet-based exploitation. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must be on the same adjacent network segment (LAN or Wi-Fi) as the TOTOLINK T6 router - CVSS AV:A explicitly excludes internet-based exploitation. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 4.3 (Medium) with vector AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L accurately reflects the constrained threat model: adjacency-limited, no credential requirement, but impact capped at partial availability degradation. … 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 has been identified at time of analysis - no fix version appears in the CVE data or references. … Detailed patch versions, workarounds, and compensating controls in full report. |
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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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