CVE-2025-34227
Published: 25 September 2025
Summary
CVE-2025-34227 is a high-severity OS Command Injection (CWE-78) vulnerability in Nagios Nagios Xi. Its CVSS base score is 8.8 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Unix Shell (T1059.004); ranked in the top 15.0% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
Directly validates and sanitizes user inputs to the Nagios XI wizards to block injection of shell characters into service arguments.
Ensures timely identification, reporting, and patching of the command injection flaw in Nagios XI versions prior to 2026R1.
Enforces least privilege for the nagios user to restrict the scope and impact of arbitrary commands executed via the vulnerability.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
The vulnerability is an authenticated command injection in the Nagios XI Configuration Wizard (MySQL/PostgreSQL wizards), allowing arbitrary shell commands to be executed as the nagios user via Unix shell interpreters when tainted arguments are passed to system commands.
NVD Description
Nagios XI < 2026R1 is vulnerable to an authenticated command injection vulnerability within the MongoDB Database, MySQL Query, MySQL Server, Postgres Server, and Postgres Query wizards. It is possible to inject shell characters into arguments provided to the service and…
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execute arbitrary system commands on the underlying host as the `nagios` user.
Deeper analysisAI
CVE-2025-34227 is an authenticated command injection vulnerability (CWE-78) affecting Nagios XI versions prior to 2026R1. The issue exists within the MongoDB Database, MySQL Query, MySQL Server, Postgres Server, and Postgres Query wizards, where shell characters can be injected into arguments provided to these services. This enables execution of arbitrary system commands on the underlying host as the `nagios` user. The vulnerability carries a CVSS v3.1 base score of 8.8 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) and was published on 2025-09-25.
An authenticated attacker with low privileges can exploit this vulnerability remotely over the network with low complexity and no user interaction required. Exploitation allows the attacker to execute arbitrary commands as the `nagios` user, potentially leading to high-impact effects on confidentiality, integrity, and availability of the affected system.
Advisories point to upgrading to Nagios XI 2026R1 as the primary mitigation. Relevant resources include technical details at https://theyhack.me/CVE-2025-34227-Nagios-XI-Wizard-Command-Injection/, the Nagios changelog at https://www.nagios.com/changelog/, the security products page at https://www.nagios.com/products/security/, and a VulnCheck advisory at https://www.vulncheck.com/advisories/nagios-xi-config-wizard-auth-command-injection.
Details
- CWE(s)