CVE-2025-6654
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on systems running vulnerable versions of PDF-XChange Editor by tricking users into opening malicious PRC files. The flaw exists in how the software parses PRC files without proper bounds checking, enabling buffer overflow attacks. Users of PDF-XChange Editor who open untrusted PRC files are at risk.
💻 Affected Systems
- PDF-XChange Editor
📦 What is this software?
Pdf Tools by Pdf Xchange
Pdf Xchange Editor by Pdf Xchange
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining the same privileges as the PDF-XChange Editor process, potentially leading to data theft, ransomware deployment, or lateral movement within the network.
Likely Case
Malicious code execution in the context of the current user, allowing file system access, credential harvesting, and installation of additional malware.
If Mitigated
Limited impact with proper application sandboxing and privilege restrictions, potentially resulting in application crash but no code execution.
🎯 Exploit Status
Exploitation requires user interaction to open a malicious file. The vulnerability is documented by ZDI (ZDI-CAN-26729) and likely to be weaponized given the CVSS score and RCE nature.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific patched version
Vendor Advisory: https://www.pdf-xchange.com/support/security-bulletins.html
Restart Required: Yes
Instructions:
1. Visit the PDF-XChange security bulletins page
2. Download the latest version of PDF-XChange Editor
3. Install the update following vendor instructions
4. Restart the application and system if required
🔧 Temporary Workarounds
Disable PRC file association
windowsRemove PRC file type association with PDF-XChange Editor to prevent automatic opening
Control Panel > Default Programs > Associate a file type or protocol with a program > Select .prc > Change program > Choose another application
Application sandboxing
windowsRun PDF-XChange Editor with reduced privileges using application control solutions
🧯 If You Can't Patch
- Implement application whitelisting to block execution of PDF-XChange Editor
- Use email/web gateways to block PRC file attachments and downloads
🔍 How to Verify
Check if Vulnerable:
Check PDF-XChange Editor version against vendor advisory for vulnerable versionsCheck Version:
Open PDF-XChange Editor > Help > AboutVerify Fix Applied:
Verify installed version matches or exceeds the patched version listed in vendor advisory📡 Detection & Monitoring
Log Indicators:
- Application crashes of PDF-XChange Editor
- Unusual process creation from PDF-XChange Editor
- PRC file processing in application logs
Network Indicators:
- Downloads of PRC files from untrusted sources
- Outbound connections from PDF-XChange Editor process
SIEM Query:
Process:PDF-XChange Editor AND (FileExtension:prc OR CrashEvent)