EUVD-2026-68675
GHSA-75w8-p2fr-p2f6
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Unauthenticated low-complexity network POST deletes firewall rules, so I:H; no direct data disclosure (C:N) and the device stays operational (A:N), diverging from the input's C:H.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
4DescriptionCVE.org
Incorrect access control in the delIpPortFilterRules function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to remove firewall filter rules via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
AnalysisAI
Firewall rule tampering in the TOTOLINK T6 router (firmware 4.1.5cu.748_B20211015) lets remote unauthenticated attackers delete IP/port filter rules by sending a crafted POST request to the delIpPortFilterRules handler in /cgi-bin/cstecgi.cgi. The missing access-control check means anyone able to reach the device's web interface can silently strip its firewall protections, exposing previously blocked internal services. …
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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 HTTP management endpoint /cgi-bin/cstecgi.cgi and the ability to send a crafted POST request invoking the delIpPortFilterRules function; per the CVSS vector (PR:N/UI:N) no authentication, credentials, or user interaction are needed 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, score 9.1) reflects trivial, unauthenticated, low-complexity network exploitation, which is credible given the described single crafted POST. … 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 fixed firmware version is confirmed in the available data; check the TOTOLINK download portal (https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/190/ids/36.html) for an updated T6 firmware image superseding 4.1.5cu.748_B20211015 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 running firmware version 4.1.5cu.748_B20211015 or earlier and immediately apply compensating controls. …
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Same weakness CWE-284 – Improper Access Control
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External POC / Exploit Code
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