EUVD-2026-68588
GHSA-4pvw-j7mm-g95w
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Unauthenticated low-complexity POST reaches the handler (PR:N/AC:L/AV:N), but the described effect is unauthorized modification of filtering config, so I:H with no direct confidentiality or availability loss.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
5DescriptionCVE.org
Incorrect access control in the setVpnPassCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to weaken edge filtering via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
AnalysisAI
Unauthenticated access-control bypass in the TOTOLINK T6 router (firmware 4.1.5cu.748_B20211015) lets remote attackers reconfigure the device's VPN pass-through / edge-filtering settings by sending a crafted POST request to the /cgi-bin/cstecgi.cgi endpoint, which fails to authenticate calls to the setVpnPassCfg function. Successful exploitation weakens the router's perimeter filtering, degrading the security posture protecting devices behind it. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires network reachability to the router's HTTP management interface and the ability to POST to /cgi-bin/cstecgi.cgi invoking the setVpnPassCfg function; per CVSS PR:N/UI:N no authentication or user interaction is needed. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals conflict and should be weighed carefully. … 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 exact vendor-released fix version is identified in the available data at time of analysis; check the TOTOLINK firmware download portal (https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/190/ids/36.html and https://www.totolink.net/) for a firmware build newer than 4.1.5cu.748_B20211015 for the T6 and flash it once available. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: conduct an immediate inventory of all TOTOLINK T6 routers to identify devices running firmware 4.1.5cu.748_B20211015 or earlier, restrict network access to the /cgi-bin/cstecgi.cgi endpoint via firewall rules to trusted administrative sources only, and enable detailed logging for all access to this endpoint. …
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Same weakness CWE-284 – Improper Access Control
View allSame technique Authentication Bypass
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External POC / Exploit Code
Leaving vuln.today