EUVD-2026-31544
GHSA-pj7j-39r4-pr94
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. The impacted element is the function setScheduleCfg of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. Executing a manipulation of the argument mode can lead to os command injection. It is possible to launch the attack remotely. 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 by manipulating the 'mode' parameter sent to the setScheduleCfg function in /cgi-bin/cstecgi.cgi. Publicly available exploit code exists (published via VulDB and a GitHub PoC), though there is no public exploit identified as actively exploited in the wild and EPSS probability is modest at 0.89%. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network reachability to the device's Web Management Interface (HTTP/HTTPS on the LAN by default, or WAN if remote administration is enabled) and the ability to send a request to /cgi-bin/cstecgi.cgi invoking the setScheduleCfg endpoint with an attacker-controlled 'mode' argument. … 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 with high confidentiality, integrity, and availability impact reflects a textbook remote-unauthenticated RCE-class issue, and the E:P (Proof-of-Concept) threat metric aligns with the public PoC on GitHub. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker on the same network as the router - or on the internet if WAN administration is enabled - sends a crafted HTTP POST to /cgi-bin/cstecgi.cgi invoking setScheduleCfg with a 'mode' value containing shell metacharacters (e.g., a semicolon followed by a wget|sh chain). Because the CGI runs as root and input is concatenated into a shell command, the injected payload executes with full privileges, allowing the attacker to pull down a botnet implant, alter DNS settings, or pivot into the LAN. … |
| Remediation | No vendor-released patch identified at time of analysis - neither VulDB nor the EUVD/NVD records cite a fixed firmware build. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify and inventory all TOTOLINK A8000RU routers with internet-facing Web Management Interfaces. …
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External POC / Exploit Code
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