medium CVSS 5.5

CVE-2025-65093·PHP vulnerability

LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. Prior to version 25.11.0, a boolean-based blind SQL injection vulnerability was identified in the LibreNMS application at the /ajax_output.php endpoint. The hostname parameter is interpolated directly into an SQL query without proper sanitization or parameter binding, allowing an attacker to manipulate the query logic and infer data from the database through conditional responses. This issue has been patched in version 25.11.0.

Severity
medium
Software
PHP
Fixed in
25.11.0
Published
2025-11-18

Affected versions

Until: 25.11.0

Fixed in: 25.11.0

How to fix this CVE

Update LibreNMS to version 25.11.0 or later to patch a SQL injection vulnerability in the /ajax_output.php endpoint. The hostname parameter was not properly sanitized, allowing attackers to extract sensitive database information through boolean-based blind SQL injection. Ensure your deployment runs the patched version and verify proper input validation is in place across all user-facing endpoints.

sudo dnf upgrade php

Defensia detects this vulnerability

What an exploitation attempt looks like

Sample log line indicative of exploitation attempts:

POST|GET /ajax_output.php\?hostname=.*['"]?\s*(AND|OR|UNION|SELECT|NOT|LIKE|IN)\s+[0-9a-zA-Z_]+ HTTP/1\.[01]

WAF mitigation (if patching is not yet possible)

Add this rule to your WAF to block exploitation attempts while you schedule the patch. 

Implement WAF rules to block requests to /ajax_output.php containing SQL keywords (UNION, SELECT, AND, OR) in the hostname parameter. Use output encoding and content-type enforcement. Example: Block if hostname parameter contains regex pattern: (UNION|SELECT|INSERT|UPDATE|DELETE|DROP|AND|OR|--|;|/\*|\*/) after URL decoding.

How to check if you are affected

  1. Check installed LibreNMS version: grep -i 'version' /opt/librenms/VERSION 2>/dev/null || cat /opt/librenms/composer.json | grep '"version"'
  2. Verify /ajax_output.php exists and check file modification time: ls -la /opt/librenms/html/ajax_output.php
  3. Search web server logs for suspicious /ajax_output.php requests with hostname parameter containing SQL syntax: grep -i 'ajax_output.php.*hostname.*\(AND\|OR\|UNION\|SELECT\)' /var/log/apache2/access.log /var/log/nginx/access.log
  4. Confirm the patched version is running: curl -s http://localhost/librenms/ | grep -i 'version.*25\.11' || php -r 'echo include("/opt/librenms/includes/version.php");'

FAQ

What is CVE-2025-65093?

CVE-2025-65093 is a boolean-based blind SQL injection vulnerability in LibreNMS prior to version 25.11.0, where the hostname parameter in the /ajax_output.php endpoint is directly concatenated into SQL queries without proper escaping or parameterized statements, allowing attackers to infer database contents.

Is CVE-2025-65093 being actively exploited?

No, this vulnerability is not currently listed on the CISA KEV catalog and no public exploits have been disclosed, but the attack surface is significant given LibreNMS is internet-facing in many environments.

What versions of LibreNMS are affected by CVE-2025-65093?

All versions prior to 25.11.0 are vulnerable. Version 25.11.0 and later contain the fix.

How do I check if my server is vulnerable to CVE-2025-65093?

Run `grep -r 'hostname' /opt/librenms/html/ajax_output.php | head -5` to view the code, or check your LibreNMS version with `cat /opt/librenms/VERSION` and verify it is 25.11.0 or higher.

Does Defensia detect CVE-2025-65093?

Yes — Defensia's CVE advisory scanner compares installed package versions against the NVD database. If LibreNMS is installed on a monitored server, CVE-2025-65093 will appear in your dashboard with remediation steps.

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References

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