EUVD-2026-31606
GHSA-wr4g-w636-jw9m
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. Affected is the function setRemoteCfg 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 can be executed 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 via the 'enable' parameter of the setRemoteCfg function in /cgi-bin/cstecgi.cgi. Publicly available exploit code exists, raising the practical risk despite the device not being listed in CISA KEV; EPSS sits at 0.89% (76th percentile), reflecting moderate predicted exploitation likelihood.
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network reachability to the Totolink A8000RU web management interface (typically TCP/80 or TCP/443) and that the device is running firmware 7.1cu.643_b20200521. … 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 on the vulnerable system (VC:H/VI:H/VA:H) describes the worst-case profile: remote, network-reachable, no authentication, no user interaction, low complexity. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker scans the internet for Totolink A8000RU devices exposing the web management interface, then sends a single crafted HTTP POST to /cgi-bin/cstecgi.cgi invoking setRemoteCfg with shell metacharacters embedded in the 'enable' argument, achieving command execution as the web server process (typically root on embedded Linux routers). With a public PoC already available on GitHub, this is trivially reproducible and lends itself to botnet recruitment, DNS hijacking, or pivoting onto the internal LAN. |
| Remediation | No vendor-released patch identified at time of analysis - there is no fixed firmware version published in the available references. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Conduct asset discovery to identify all Totolik A8000RU units (particularly firmware 7.1cu.643_b20200521) connected to networks with internet-facing management access; immediately isolate or block external access to affected devices. …
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External POC / Exploit Code
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