Authenticated Remote Command Execution Vulnerability in Nagios XI by Nagios
CVE-2020-36856

9.4CRITICAL

Key Information:

Vendor

NagiOS

Status
Xi
Vendor
CVE Published:
30 October 2025

What is CVE-2020-36856?

Nagios XI versions prior to 5.6.14 are vulnerable to an authenticated remote command execution flaw due to insufficient validation of the 'address' parameter in the CCM command_test.php script. An authenticated user with access to the Core Config Manager can exploit this vulnerability to inject shell metacharacters, leading to arbitrary command execution with the privileges of the Nagios XI web application user. This may allow attackers to run commands on the underlying host, alter system configurations, or gain complete control over the system.

Affected Version(s)

XI 0 < 5.6.14

References

https://www.nagios.com/products/security/#nagios-xi
vendor-advisorypatch
https://www.nagios.com/changelog/nagios-xi/
release-notespatch
https://www.vulncheck.com/advisories/nagios-xi-authentica...
third-party-advisory

CVSS V4

Score:
9.4
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

IBM X-Force Exchange
.