CVE-2018-20434

Severity: critical (CVSS 9.8 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 71.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2019-04-24 · updated 2026-06-17
Weakness: CWE-78

Description

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.

Affected products

librenms: 1.46

References

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=sharing
https://gist.github.com/mhaskar/516df57aafd8c6e3a1d70765075d372d
https://shells.systems/librenms-v1-46-remote-code-execution-cve-2018-20434/
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=sharing
https://gist.github.com/mhaskar/516df57aafd8c6e3a1d70765075d372d
https://shells.systems/librenms-v1-46-remote-code-execution-cve-2018-20434/

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