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CVE-2018-20434 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:9.8 CRITICALVector:CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
http://packetstormsecurity.com/files/153188/LibreNMS-addhost-Command-Injection.html	CVE
http://packetstormsecurity.com/files/153448/LibreNMS-1.46-addhost-Remote-Code-Execution.html	CVE
https://drive.google.com/file/d/1LcGmOY8x-TG-wnNr-cM_f854kxk0etva/view?usp=sharing	CVE	Permissions RequiredThird Party Advisory
https://gist.github.com/mhaskar/516df57aafd8c6e3a1d70765075d372d	CVE	ExploitThird Party Advisory
https://shells.systems/librenms-v1-46-remote-code-execution-cve-2018-20434/	CVE	ExploitTechnical DescriptionThird Party Advisory
http://packetstormsecurity.com/files/153188/LibreNMS-addhost-Command-Injection.html	[email protected]
http://packetstormsecurity.com/files/153448/LibreNMS-1.46-addhost-Remote-Code-Execution.html	[email protected]
https://drive.google.com/file/d/1LcGmOY8x-TG-wnNr-cM_f854kxk0etva/view?usp=sharing	[email protected]	Permissions RequiredThird Party Advisory
https://gist.github.com/mhaskar/516df57aafd8c6e3a1d70765075d372d	[email protected]	ExploitThird Party Advisory
https://shells.systems/librenms-v1-46-remote-code-execution-cve-2018-20434/	[email protected]	ExploitTechnical DescriptionThird Party Advisory

see all 10 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-78	Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')	[email protected]

Affected Products

Product	Versions
librenms librenms	1.46
CPE cpe:2.3:a:librenms:librenms:1.46:::::::* Remediation No remediation found in references.

Change History

6 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Jun 28, 2019	CVE Modified	[email protected]
Jun 4, 2019	CVE Modified	[email protected]
Apr 30, 2019	Initial Analysis	[email protected]