EUVD-2026-68649
GHSA-8fj4-cvwx-w9w2
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Unauthenticated network POST (AV:N/AC:L/PR:N/UI:N) overwrites MAC filter rules, a high integrity/access-control change with possible client lockout (A:L); no confidentiality disclosure is described, so C:N.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
4DescriptionCVE.org
Incorrect access control in the setMacFilterRules function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to change device access control via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
AnalysisAI
Access control bypass in the TOTOLINK T6 router (firmware 4.1.5cu.748_B20211015) lets remote unauthenticated attackers rewrite the device's MAC filtering rules by sending a crafted POST request to the setMacFilterRules handler at /cgi-bin/cstecgi.cgi. Because no authentication is enforced, an attacker with network reachability to the web interface can alter which clients are permitted or blocked on the network. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network reachability to the router's HTTP management endpoint /cgi-bin/cstecgi.cgi and the ability to send a POST invoking the setMacFilterRules function; no authentication, credentials, or user interaction are needed (PR:N/UI:N), and it works against the affected firmware 4.1.5cu.748_B20211015. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The supplied CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N, base 9.1) rates this Critical, reflecting trivial, network-based, unauthenticated exploitation. … 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 or fixed firmware version is identified in the available data (the references point to TOTOLINK's general download portal and vendor-coordination trackers, not a specific patched build), so apply compensating controls now: disable remote/WAN management so /cgi-bin/cstecgi.cgi is never reachable from the internet (primary mitigation, low functional impact for home users); restrict access to the router web UI to trusted management hosts/VLANs via firewall or ACL; and if feasible do not rely on MAC filtering as a security boundary, since it is both weak and now attacker-modifiable. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all TOTOLINK T6 routers in production and confirm firmware versions; immediately restrict web interface access via firewall rules and disable MAC filtering if operationally feasible. …
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External POC / Exploit Code
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