CVE-2025-34227Public exploitNetwork attack vector

Authenticated command execution via wizard parameters

Published Sep 25, 2025 · Updated May 15, 2026

OS command injection in Nagios XI before 2026R1 allows remote authenticated users to execute commands as the nagios user. The monitoringwizard.php handler passes unneutralized database and query values into service-check command arguments, allowing shell delimiters to introduce additional commands. Administrative wizard access and valid session state are required; successful exploitation runs arbitrary system commands on the host with nagios-account privileges.

CVSS severity8.6
High
EPSS probability24.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in Nagios XI before 2026R1 allows remote authenticated users to execute commands as the nagios user. The monitoringwizard.php handler passes unneutralized database and query values into service-check command arguments, allowing shell delimiters to introduce additional commands. Administrative wizard access and valid session state are required; successful exploitation runs arbitrary system commands on the host with nagios-account privileges.

The record

CVE
CVE-2025-34227
Published
Sep 25, 2025
Updated
May 15, 2026
Vendor
Nagios Enterprises, LLC
Product
Nagios XI
Classifications
CWE-78, CAPEC-88, T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 25, 2025CVE publishedPublication date reported by the CVE source.
  2. May 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2026R1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Nagios Enterprises, LLC · Nagios XIversion=0 <2026R1

Published CVSS scores

8.8NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.6VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CAPEC-88OS Command Injection
T1059.004Unix Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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