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    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 /ajax_output.php?id=capture&format=text&type=snmpwalk&hostname=localhost request that triggers html/includes/output/capture.inc.php command mishandling.

    Published:Apr 24, 2019
    Last Modified:Nov 21, 2024
    EPS:Apr 24, 2019
    EPSS Score:0.66987
    CVSS Score:9.8

    Affected Products

    Vendor
    Librenms
    Product
    Librenms

    Exploits

    https://gist.github.com/mhaskar/516df57aafd8c6e3a1d70765075d372dhttps://shells.systems/librenms-v1-46-remote-code-execution-cve-2018-20434/https://gist.github.com/mhaskar/516df57aafd8c6e3a1d70765075d372dhttps://shells.systems/librenms-v1-46-remote-code-execution-cve-2018-20434/https://www.exploit-db.com/exploits/46970https://github.com/mhaskar/CVE-2018-20434https://www.exploit-db.com/exploits/47044

    Related CVEs

    CVE-2026-86427 (CVSS 8.7) — LibreNMS before 26.8.0 contains an argument injection vulnerability in the graph_title parameter that allows a…
    CVE-2026-86426 (CVSS 9.2) — LibreNMS before 26.8.0 contains an authentication bypass vulnerability in the REST API that allows unauthentic…
    CVE-2026-84194 (CVSS 8.6) — LibreNMS versions >= 23.10.0 and < 26.2.0 (fixed in 26.4.0) contain an authenticated OS command injection vuln…
    CVE-2026-84193 (CVSS 5.8) — LibreNMS through 26.2.0 contains a stored cross-site scripting vulnerability in legacy PHP template pages that…
    CVE-2026-84192 (CVSS 7.1) — LibreNMS before 26.3.1 contains a stored cross-site scripting vulnerability in legacy PHP templates that outpu…
    CVE-2026-84191 (CVSS 5.3) — LibreNMS before 26.5.0 contains stored cross-site scripting vulnerabilities in VRF display pages where mplsVpn…
    CVE-2026-84190 (CVSS 8.7) — LibreNMS versions before 26.5.0 contain a remote code execution vulnerability in the AboutController where the…
    CVE-2026-84189 (CVSS 9.2) — LibreNMS through 26.4.0 renders JSON fields (name, ip, model, author, commit message) returned by the admin-co…
    CVE-2026-84188 (CVSS 4.8) — LibreNMS versions <= 26.4.0 contain a stored cross-site scripting vulnerability in the graph_descr.<graphtype>…
    CVE-2026-55182 (CVSS 8.6) — LibreNMS is a network monitoring system. In versions from 21.6.0 up to 26.5.0, the Signal alert transport is v…

    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/

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High