EUVD-2026-68633
GHSA-5h6r-fmm3-4x2j
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Network-reachable unauthenticated CGI endpoint; no credentials needed; only integrity (rule deletion) is affected, not confidentiality or availability.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
4DescriptionCVE.org
Incorrect access control in the delPortForwardRules function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to delete port-forwarding rules via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
AnalysisAI
Unauthenticated deletion of port-forwarding rules is possible on TOTOLINK T6 routers running firmware 4.1.5cu.748_B20211015 due to missing access control in the delPortForwardRules function. An attacker with network access to the router's web management interface can send a crafted POST request to /cgi-bin/cstecgi.cgi and silently remove NAT port-forwarding rules without any credentials. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The TOTOLINK T6 router's web management interface (typically HTTP on port 80) must be reachable by the attacker - from the WAN if remote management is enabled, or from within the LAN. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.5 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N) accurately reflects a low-effort, unauthenticated, network-reachable attack with significant integrity impact. … 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 | Visit the TOTOLINK firmware download page at https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/190/ids/36.html and check for a firmware release newer than 4.1.5cu.748_B20211015 that addresses this access control flaw - no confirmed patched version has been identified from available data. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all TOTOLINK T6 routers and identify instances running firmware 4.1.5cu.748_B20211015 or earlier; immediately restrict network access to the web management interface (port 80/443) to trusted administrative networks only, or disable remote management entirely if not operationally critical. …
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Same weakness CWE-284 – Improper Access Control
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External POC / Exploit Code
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