CVE-2020-36856

CRITICAL EPSS 80.6%
Published Oct 30, 20258mo ago · Modified Jun 17, 20261w ago
9.4 CVSS 4.0
Critical
Find Similar
Published Oct 30, 2025 8mo ago
Last Modified Jun 17, 2026 1w ago

Description

Nagios XI versions prior to 5.6.14 contain an authenticated remote command execution vulnerability in the CCM command_test.php script. Insufficient validation of the `address` parameter allows an authenticated user with access to the Core Config Manager to inject shell metacharacters that are incorporated into backend command invocations. Successful exploitation enables arbitrary command execution with the privileges of the Nagios XI web application user and may be leveraged to execute commands on the underlying XI host, modify system configuration, or fully compromise the host.

CVSS Details

Base Score
9.4
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required High
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
80.6% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-78 OS Command Injection Injection

Affected Products 1

VendorProductVersionRange
nagiosnagios_xi* <5.6.14

References 3

  • nagios.com https://www.nagios.com/changelog/nagios-xi/
    Release Notes
  • nagios.com https://www.nagios.com/products/security/#nagios-xi
    Release Notes
  • vulncheck.com https://www.vulncheck.com/advisories/nagios-xi-authenticated-rce-command-test-php-via-address
    Third Party Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.