EUVD-2026-68590
GHSA-mjf8-rx8p-ccqq
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Network-reachable CGI endpoint with no authentication enforced (PR:N); DDNS config overwrite is pure integrity impact with no confidentiality or availability consequence.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
4DescriptionCVE.org
Incorrect access control in the setDdnsCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to alter dynamic DNS state via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
AnalysisAI
Unauthenticated DDNS configuration manipulation in TOTOLINK T6 firmware 4.1.5cu.748_B20211015 allows any network-accessible attacker to alter dynamic DNS state without credentials. The setDdnsCfg function in the CGI-based web interface (/cgi-bin/cstecgi.cgi) fails to enforce access control, making exploitation trivial via a crafted POST request. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The router's web management interface (/cgi-bin/cstecgi.cgi) must be reachable by the attacker over the network. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N) scores 7.5 (High), reflecting a network-reachable, zero-complexity, unauthenticated attack - consistent with the missing authentication check described. … 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 version is independently confirmed from the available data. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all TOTOLINK T6 routers in your environment and verify firmware version 4.1.5cu.748_B20211015; immediately restrict firewall access to the management interface (/cgi-bin/cstecgi.cgi) to authorized administrative networks only. …
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Same weakness CWE-284 – Improper Access Control
View allSame technique Authentication Bypass
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External POC / Exploit Code
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