EUVD-2026-31712
GHSA-prcq-7777-rj56
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
3DescriptionCVE.org
A weakness has been identified in Totolink A8000RU 7.1cu.643_b20200521. Impacted is the function setParentalRules of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. Executing a manipulation of the argument enable can lead to os command injection. The attack may be performed from remote. The exploit has been made available to the public and could be used for attacks.
AnalysisAI
OS command injection in the Totolink A8000RU router (firmware 7.1cu.643_b20200521) allows remote unauthenticated attackers to execute arbitrary operating system commands via the 'enable' parameter of the setParentalRules function in /cgi-bin/cstecgi.cgi. Publicly available exploit code exists, and while the EPSS score of 0.89% (76th percentile) suggests moderate predicted exploitation likelihood, the network-accessible attack surface on an edge device elevates real-world risk significantly.
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network reachability to the Totolink A8000RU's Web Management Interface at /cgi-bin/cstecgi.cgi on firmware build 7.1cu.643_b20200521; per the CVSS 4.0 vector (PR:N/UI:N/AC:L/AT:N) no authentication, user interaction, or special configuration is required, and attack complexity is low. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N) indicates network-reachable, low-complexity, unauthenticated exploitation with high confidentiality, integrity, and availability impact (VC:H/VI:H/VA:H), scoring 8.9. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who can reach the router's web management interface (either via a WAN-exposed admin panel or from within the LAN, e.g., from a compromised host or open guest network) sends a crafted HTTP POST to /cgi-bin/cstecgi.cgi invoking setParentalRules with shell metacharacters embedded in the 'enable' parameter. The injected command executes with the privileges of the web server process (typically root on embedded routers), enabling the attacker to add a persistent backdoor account, exfiltrate Wi-Fi credentials, or enroll the device in a botnet. … |
| Remediation | No vendor-released patch identified at time of analysis - Totolink has not published a firmware update or security advisory referenced in the available intelligence. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify and isolate all Totolik A8000RU devices; remove non-critical units from production immediately. …
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External POC / Exploit Code
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