CVE-2025-66496
📋 TL;DR
A memory corruption vulnerability in Foxit PDF Reader's 3D annotation handling allows attackers to cause out-of-bounds memory access via specially crafted PRC content in PDF files. This could lead to application crashes or potentially arbitrary code execution. Users of Foxit PDF Reader who open untrusted PDF files are affected.
💻 Affected Systems
- Foxit PDF Reader
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with the privileges of the PDF reader user, potentially leading to full system compromise.
Likely Case
Application crash (denial of service) when opening malicious PDF files.
If Mitigated
Limited to application crash if memory protections like ASLR/DEP are effective.
🎯 Exploit Status
Exploitation requires user interaction to open malicious PDF. Memory corruption vulnerabilities can be challenging to weaponize reliably.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown specific version - check Foxit security bulletins
Vendor Advisory: https://www.foxit.com/support/security-bulletins.html
Restart Required: Yes
Instructions:
1. Visit Foxit's security bulletins page
2. Identify the patch for CVE-2025-66496
3. Download and install the latest Foxit PDF Reader version
4. Restart the application
🔧 Temporary Workarounds
Disable 3D content processing
allConfigure Foxit PDF Reader to disable 3D content rendering
Navigate to Edit > Preferences > Security (Enhanced) > uncheck 'Enable 3D'
Use alternative PDF viewer
allTemporarily use a different PDF reader that doesn't process PRC content
🧯 If You Can't Patch
- Restrict PDF file sources to trusted locations only
- Implement application whitelisting to block Foxit PDF Reader execution
🔍 How to Verify
Check if Vulnerable:
Check Foxit PDF Reader version against patched versions in Foxit security bulletinsCheck Version:
In Foxit PDF Reader: Help > About Foxit ReaderVerify Fix Applied:
Verify installed version matches or exceeds the patched version listed in Foxit advisory📡 Detection & Monitoring
Log Indicators:
- Application crash logs from Foxit Reader
- Windows Event Logs showing application faults
Network Indicators:
- PDF file downloads from untrusted sources
- Email attachments with PDF files
SIEM Query:
source="*foxit*" AND (event_type="crash" OR severity="critical")