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CVE-2019-15949

Nagios XI Remote Code Execution

8.8 HIGHActively exploited (CISA KEV)Public exploitEPSS 77.0%
  1. Published5 Sept 2019
  2. Added to CISA KEV3 Nov 2021
  3. Remediation due3 May 2022
Actively exploited (CISA KEV)

Nagios XI contains a remote code execution vulnerability in which a user can modify the check_plugin executable and insert malicious commands to execute as root.

Added to KEV: 3 Nov 2021Federal remediation due: 3 May 2022

Description

Nagios XI before 5.6.6 allows remote command execution as root. The exploit requires access to the server as the nagios user, or access as the admin user via the web interface. The getprofile.sh script, invoked by downloading a system profile (profile.php?cmd=download), is executed as root via a passwordless sudo entry; the script executes check_plugin, which is owned by the nagios user. A user logged into Nagios XI with permissions to modify plugins, or the nagios user on the server, can modify the check_plugin executable and insert malicious commands to execute as root.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Nagios Xi< 5.6.6

Remediation

Fixed in
Nagios Xi≥ 5.6.6

References

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Frequently asked

Is CVE-2019-15949 being actively exploited?

Yes. CVE-2019-15949 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 3 Nov 2021.

How severe is CVE-2019-15949?

CVE-2019-15949 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 77.0% probability of exploitation.

Which products are affected by CVE-2019-15949?

Affected products include Nagios Xi.

How do I fix CVE-2019-15949?

Upgrade affected software to a fixed version, for example Nagios Xi 5.6.6 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2019-15949 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.