🛡️ CVE-2018-20434 — librenms

🔴 CVSS 9.5 — Critical ✅ No Known Exploit CWE-78 OSV
9.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

LibreNMS arbitrary OS commands execution

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

CVE-2018-20434 is classified as CWE-78: OS Command Injection. Untrusted input reaches a shell command without neutralisation, so an attacker can run arbitrary operating system commands.

Affected software

CVE-2018-20434 is recorded against 1 package.

  • librenms/librenms

Timeline and source

Published on 24 May 2022 and last revised on 24 April 2024. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

nvd.nist.gov (Advisory)
drive.google.com (Web)
gist.github.com (Web)
github.com (Package)
shells.systems (Web)

Details

Severity CRITICAL
CVSS Score 9.5
CVSS Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE CWE-78
Public Exploit ✅ No
Source OSV
Published 2022-05-24
Updated 2026-08-12
Modified 2024-04-24
Fix URL N/A

Affected Packages

Software From version Fixed in
librenms/librenms — —

Similar Threats

Exploit Protection

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