CVE-2025-34288

Nagios XI Privilege Escalation via Writable PHP Include Executed with Sudo

Published Dec 16, 2025 CVSS 4.0 · 8.6 High EPSS 1.9% KEV · Not listed
Description
Nagios XI versions prior to 2026R1.1 are vulnerable to local privilege escalation due to an unsafe interaction between sudo permissions and application file permissions. A user‑accessible maintenance script may be executed as root via sudo and includes an application file that is writable by a lower‑privileged user. A local attacker with access to the application account can modify this file to introduce malicious code, which is then executed with elevated privileges when the script is run. Successful exploitation results in arbitrary code execution as the root user.

Remediation

Vendor Solution

According to the vendor changelog, this issue was addressed by changing the ownership of constants.inc.php.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
CPEs cpe:2.3:a:nagios:nagios_xi:*:*:*:*:*:*:*:*
cpe:2.3:a:nagios:nagios_xi:2026:r1.0.1:*:*:*:*:*:*
cpe:2.3:a:nagios:nagios_xi:2026:r1:*:*:*:*:*:*
Metrics cvssV3_1

{'score': 6.7, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H'}

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Nagios
Nagios nagios Xi
Nagios xi
Vendors & Products Nagios
Nagios nagios Xi
Nagios xi
Type Values Removed Values Added
Description Nagios XI versions prior to 2026R1.1 are vulnerable to local privilege escalation due to an unsafe interaction between sudo permissions and application file permissions. A user‑accessible maintenance script may be executed as root via sudo and includes an application file that is writable by a lower‑privileged user. A local attacker with access to the application account can modify this file to introduce malicious code, which is then executed with elevated privileges when the script is run. Successful exploitation results in arbitrary code execution as the root user.
Title Nagios XI Privilege Escalation via Writable PHP Include Executed with Sudo
Weaknesses CWE-732
References
Metrics cvssV4_0

{'score': 8.6, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
May 14, 2026, 2:08 AM
Reserved
Apr 15, 2025, 7:15 PM
Status
Analyzed
Published
Dec 16, 2025, 11:15 PM
Modified
Jun 17, 2026, 9:13 AM