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…
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 71.5%, higher than 99% of all known CVEs. Patch or mitigate before the next change window.
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.
- CVSS 3.0
- 9.8 CRITICALCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 71.49% probability · 99th percentile
- Public exploits
- 2 in Exploit-DB · verified · first 5 June 2019
- CISA KEV
- Not listed
- Weakness
- CWE-78
- Affected
- librenms/librenms
- Source
- cve@mitre.org
EPSS moved from 65.0% on 21 September 2026 to 71.5% on 27 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
Public exploits (2)
Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.