EUVD-2026-68533
GHSA-537g-8cpm-mc3r
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Unauthenticated network access to the CGI is real (AV:N/AC:L/PR:N/UI:N), but the described impact is limited to reading upgrade status and altering bookkeeping, so C:L/I:L and A:N rather than the input's H/H/H.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
4DescriptionCVE.org
Incorrect access control in the getSlaveUpdate function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to query slave upgrade status and affect upgrade bookkeeping via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
AnalysisAI
Broken access control in the getSlaveUpdate function of the TOTOLINK T6 router (firmware 4.1.5cu.748_B20211015) lets unauthenticated attackers reach a privileged CGI handler over the network and read slave-device upgrade status while tampering with upgrade bookkeeping. The flaw is exposed via crafted POST requests to /cgi-bin/cstecgi.cgi and requires no credentials, though no public exploit code has been identified and it is not in CISA KEV. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network reachability to the TOTOLINK T6 management web server and the ability to send a POST request to the /cgi-bin/cstecgi.cgi endpoint targeting the getSlaveUpdate function; per the CVSS vector (PR:N/UI:N) no authentication and no user interaction are needed. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals here conflict and must be reconciled rather than taken at face value. … 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 patched firmware version is identified in the available data, so no fixed build can be cited with confidence - monitor the TOTOLINK download portal (https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/190/ids/36.html) and the vendor-coordination trackers (github.com/DarkBoulder/CVE-Vendor-Coordination and github.com/ShengWu00/CVE-Vendor-Coordination) for a T6 release superseding 4.1.5cu.748_B20211015. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and inventory all TOTOLINK T6 routers and implement firewall rules to restrict unauthenticated access to the /cgi-bin/cstecgi.cgi endpoint from internet-facing or untrusted networks. …
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External POC / Exploit Code
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