CVE-2019-15949VulnerabilityPublished 11/03/2021Updated 10/24/2026

CVE-2019-15949: Nagios XI Remote Code Execution Vulnerability

Affects Nagios Nagios XISource CISA KEV

Severity

High

No CVSS score published yet

Exploitation: Actively exploited – in CISA KEV since 11/03/2021
KEV deadline: 05/03/2022
EPSS: 77.0% chance of exploitation in 30 days – higher than 99% of CVEs

What to do

CISA required action

Apply updates per vendor instructions.

nvd.nist.gov/vuln/detail/CVE-2019-15949 (opens in a new tab)

Description

Nagios XI contains a remote code execution vulnerability (CVE-2019-15949) that allows a user to modify the check_plugin executable and execute arbitrary commands as root. This vulnerability has been exploited in the wild and is considered high severity.

Summary

CVE-2019-15949 is a remote code execution vulnerability in Nagios XI where an attacker with the ability to modify the check_plugin executable can insert malicious commands that execute with root privileges. This flaw enables unauthorized code execution on the affected system.

Impact

Successful exploitation allows an attacker to execute arbitrary commands as root on the Nagios XI server, potentially leading to full system compromise. The vulnerability has been observed to be exploited in the wild, indicating active threat usage.

Mitigation

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict access to the Nagios XI server and the check_plugin executable to trusted users only to reduce risk.

Weaknesses

CWE-78OS Command Injection (opens in a new tab)

What to do

Description

AnalysisAI-generated, updated 10/24/2026, 09:10:14 UTC

Weaknesses

References

Related threats