What’s Vulnerable › Vulnerabilities

CVE-2025-34323: Nagios Log Server < 2026R1.0.1 Local Privilege Escalation via Writable Scripts and Sudo Rules

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-11-17 · updated 2026-10-07
• Weakness: CWE-732

Description

Nagios Log Server versions prior to 2026R1.0.1 are vulnerable to local privilege escalation due to a combination of sudo misconfiguration and group-writable application directories. The 'www-data' user is a member of the 'nagios' group, which has write access to '/usr/local/nagioslogserver/scripts', while several scripts in this directory are owned by root and may be executed via sudo without a password. A local attacker running as 'www-data' can move one of these root-owned scripts to a backup name and create a replacement script with attacker-controlled content at the original path, then invoke it with sudo. This allows arbitrary commands to be executed with root privileges, providing full compromise of the underlying operating system.

Affected products

• Nagios Log Server: before 2026; 2026-r1 — fixed in 2026

How to fix

Upgrade to a fixed version: Nagios Log Server 2026. Check the vendor advisory for mitigations.

References

• https://theyhack.me/Rooting-Nagios-Log-Server/
• https://www.nagios.com/changelog/nagios-log-server/nagios-log-server-2026r1-0-1/
• https://www.nagios.com/products/security/#log-server
• https://www.vulncheck.com/advisories/nagios-log-server-local-privilege-escalation-via-writable-scripts-and-sudo-rules

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