CVE-2018-20434

LibreNMS 1.46 allows remote attackers to execute arbitrary OS commands by using the $_POST['community'] parameter to html/pages/addhost.inc.php during creation of a new device, and then making a /ajax_output.php?id=capture&format=text&type=snmpwalk&hostname=localhost request that triggers html/includes/output/capture.inc.php command mishandling.

• CWE-78

• http://packetstormsecurity.com/files/153188/LibreNMS-addhost-Command-Injection.html
• http://packetstormsecurity.com/files/153448/LibreNMS-1.46-addhost-Remote-Code-Execution.html
• https://drive.google.com/file/d/1LcGmOY8x-TG-wnNr-cM_f854kxk0etva/view?usp=sharingPermissions Required, Third Party Advisory
• https://gist.github.com/mhaskar/516df57aafd8c6e3a1d70765075d372dExploit, Third Party Advisory
• https://shells.systems/librenms-v1-46-remote-code-execution-cve-2018-20434/Exploit, Technical Description, Third Party Advisory
• http://packetstormsecurity.com/files/153188/LibreNMS-addhost-Command-Injection.html
• http://packetstormsecurity.com/files/153448/LibreNMS-1.46-addhost-Remote-Code-Execution.html
• https://drive.google.com/file/d/1LcGmOY8x-TG-wnNr-cM_f854kxk0etva/view?usp=sharingPermissions Required, Third Party Advisory
• https://gist.github.com/mhaskar/516df57aafd8c6e3a1d70765075d372dExploit, Third Party Advisory
• https://shells.systems/librenms-v1-46-remote-code-execution-cve-2018-20434/Exploit, Technical Description, Third Party Advisory

Published

Apr 24, 2019

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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