How the Mentioned CVE Works:
CVE-2025-1695 affects NGINX Unit versions before 1.34.2 when the Java Language Module is enabled. The vulnerability arises from improper handling of specific undisclosed requests, which can trigger an infinite loop. This loop causes excessive CPU resource utilization, leading to a degradation of service and potentially a limited denial-of-service (DoS) condition. The issue is confined to the data plane, meaning the control plane remains unaffected. Attackers can exploit this remotely without requiring authentication or user interaction, making it a significant threat to systems running vulnerable versions of NGINX Unit.
DailyCVE Form:
Platform: NGINX Unit
Version: < 1.34.2
Vulnerability: Infinite Loop
Severity: Medium
Date: 03/03/2025
(End of form)
What Undercode Say:
Analytics:
- CVSS Score: 6.9 (Medium)
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
- Impact: Limited DoS due to CPU exhaustion.
- Exploitability: Remote, no authentication required.
Commands:
1. Check NGINX Unit Version:
unitd --version
2. Upgrade NGINX Unit:
sudo apt-get update && sudo apt-get install nginx-unit
3. Monitor CPU Usage:
top -b -n 1 | grep unitd
Exploit Details:
- Exploit Trigger: Send crafted requests to the Java Language Module endpoint.
- Payload Example:
POST /java-endpoint HTTP/1.1 Host: target.com Content-Type: application/json {"malicious":"payload"}
Protection Measures:
1. Upgrade to Version 1.34.2 or Later:
Download from NGINX Unit Official Site.
2. Disable Java Module if Unused:
Edit NGINX Unit configuration:
{
"listeners": {},
"applications": {}
}
3. Implement Rate Limiting:
Use NGINX or a WAF to limit request rates.
4. Monitor Logs:
Check for unusual activity:
tail -f /var/log/unit.log
References:
- NGINX Unit Documentation
- CVE-2025-1695 Details
- F5 Networks Advisory
By following these steps, you can mitigate the risk posed by CVE-2025-1695 and ensure your NGINX Unit deployment remains secure.
References:
Reported By: https://nvd.nist.gov/vuln/detail/CVE-2025-1695
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