CVE-2018-20434

Name: CVE-2018-20434
Creator: NVD / NIST
Published: 2019-04-24T21:29:00.4+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 71.49%

Last modified Jun 17, 2026

CVE-2018-20434 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 71.49% chance of exploitation in the next 30 days.

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

EPSS Probability

71.49%

99.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-78

Affected Software

Vendor	Product	Versions
Librenms	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=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

Timeline

Published: Apr 24, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-20434?

How severe is CVE-2018-20434?

Severity scoring for CVE-2018-20434 is pending analysis. The EPSS model estimates a 71.49% probability of exploitation in the next 30 days.

How do I fix CVE-2018-20434?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-20434?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST