CVE-2018-25123 Nagios XI < 5.5.7 Privilege Escalation via MRTG Graphing Component

Q: What is CVE-2018-25123?

CVE-2018-25123 is a high-severity vulnerability in Nagios Nagios Xi, published on 30 Oct 2025. It can only be exploited from the same machine or local network, with no action from the victim.

Q: Is CVE-2018-25123 being exploited?

There is no known exploitation of CVE-2018-25123 in the wild and no public exploit code.

Q: How do I fix CVE-2018-25123?

No fix has been published for CVE-2018-25123 yet. Limit exposure of the affected software until one is available.

High 8.5 Published 30 Oct 2025 Updated 17 Nov 2025

A local attacker can exploit excessive privileges in the MRTG component to gain elevated system access on Nagios XI servers.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2018-25123?

CVE-2018-25123 is a high-severity vulnerability in Nagios Nagios Xi, published on 30 Oct 2025. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

Nagios XI versions prior to 5.5.7 contain a privilege escalation vulnerability in the MRTG graphing component. MRTG-related processes/scripts executed with excessive privileges, allowing a local attacker with limited system access to abuse file/command execution paths or writable resources to gain elevated privileges.

Weakness: CWE-250

Which versions are affected by CVE-2018-25123?

It affects 1 product.

Products include Nagios Nagios Xi.

How do I fix CVE-2018-25123?

No fix has been published for CVE-2018-25123 yet. Limit exposure of the affected software until one is available.

Is CVE-2018-25123 being exploited?

There is no known exploitation of CVE-2018-25123 in the wild and no public exploit code.

All Nagios Nagios Xi vulnerabilities

Sources

Also known as GHSA-cg42-mqc9-9fhp.