CVE-2025-12140
📋 TL;DR
CVE-2025-12140 is a critical remote code execution vulnerability in applications with an insecure 'redirectToUrl' mechanism. Unauthenticated attackers can inject malicious Java expressions through the 'redirectUrlParameter' parameter, allowing arbitrary code execution on affected systems. This affects any application using the vulnerable redirect mechanism before the fixed version.
💻 Affected Systems
- Applications using the vulnerable 'redirectToUrl' mechanism
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise: attacker gains full control of the server, can steal data, deploy ransomware, pivot to internal networks, and maintain persistent access.
Likely Case
Data theft and server takeover: attackers typically exploit such vulnerabilities to exfiltrate sensitive data, install backdoors, or use the server for cryptocurrency mining or botnet activities.
If Mitigated
Limited impact if proper network segmentation, WAF rules, and input validation are in place, though the vulnerability still presents significant risk.
🎯 Exploit Status
The vulnerability description suggests straightforward exploitation by injecting Java expressions. While no public PoC exists, similar expression injection vulnerabilities are commonly weaponized quickly.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: wu#2016.1.5513#0#20251014_113353
Vendor Advisory: https://cert.pl/posts/2025/11/CVE-2025-12140/
Restart Required: Yes
Instructions:
1. Identify affected applications. 2. Update to version wu#2016.1.5513#0#20251014_113353 or later. 3. Restart the application/service. 4. Verify the fix is applied.
🔧 Temporary Workarounds
Input Validation Filter
allImplement strict input validation to reject any redirect parameters containing expression syntax
Configure WAF rules to block requests containing Java expression patterns in redirect parameters
Network Access Control
allRestrict access to vulnerable endpoints
Implement firewall rules to limit access to the redirect endpoint to trusted IPs only
🧯 If You Can't Patch
- Implement a Web Application Firewall (WAF) with rules to block Java expression patterns in URL parameters
- Disable or remove the vulnerable redirect functionality entirely if not business-critical
🔍 How to Verify
Check if Vulnerable:
Test if the application processes Java expressions in the redirectUrlParameter by attempting safe expression injection (e.g., testing with non-malicious expressions).Check Version:
Check application version against the fixed version wu#2016.1.5513#0#20251014_113353Verify Fix Applied:
After patching, attempt the same expression injection tests to confirm they are now rejected or properly sanitized.📡 Detection & Monitoring
Log Indicators:
- Unusual Java expression patterns in URL parameters
- Multiple failed redirect attempts with expression syntax
- Unexpected process execution from web application context
Network Indicators:
- HTTP requests containing Java expression syntax in parameters
- Outbound connections from web server to suspicious destinations post-exploit
SIEM Query:
source="web_logs" AND (url="*redirectUrlParameter=*" AND (url="*Runtime.*" OR url="*ProcessBuilder.*" OR url="*exec(*" OR url="*eval(*"))