CVE-2018-20434: LibreNMS 1.46 allows remote attackers to execute arbitrary OS commands by using the $_POST['community'] par...

Security readout for executives and security teams

CVE-2018-20434 is a command execution flaw reported in LibreNMS 1.46. An attacker who can reach the affected host-creation and capture workflow may cause the server to run operating system commands. That can turn a monitoring system into a foothold inside the network. Exposure is most likely for organizations running LibreNMS 1.46 with the web interface reachable by users or networks that should not manage devices. The provided evidence does not identify other affected versions or whether authentication is required. Treat this as a priority remediation item if LibreNMS 1.46 is present. Monitoring platforms often have broad network visibility, so server-level command execution can create significant operational and security impact. Mitigation focus: Identify any LibreNMS 1.46 instances in production or lab environments.; Check LibreNMS vendor guidance for the fixed release or recommended remediation.; Restrict LibreNMS administration access to trusted networks and users..

Prepared

Jun 6, 2026, 21:12 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.