CVE-2025-66498
📋 TL;DR
A memory corruption vulnerability in Foxit PDF Reader's 3D annotation handling allows attackers to execute arbitrary code or cause denial of service by tricking users into opening malicious PDF files. This affects all users of vulnerable Foxit PDF Reader versions who open untrusted PDF documents. The vulnerability stems from insufficient bounds checking when parsing U3D/PRC content.
💻 Affected Systems
- Foxit PDF Reader
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with the privileges of the current user, potentially leading to full system compromise, data theft, or ransomware deployment.
Likely Case
Application crash (denial of service) or limited memory corruption that could be leveraged for information disclosure or further exploitation.
If Mitigated
Application crash with no data loss if proper sandboxing and memory protections are enabled.
🎯 Exploit Status
Exploitation requires user interaction to open a malicious PDF. Memory corruption vulnerabilities in PDF readers have historically been weaponized quickly.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check latest version on Foxit's security bulletins page
Vendor Advisory: https://www.foxit.com/support/security-bulletins.html
Restart Required: Yes
Instructions:
1. Visit Foxit's security bulletins page
2. Download the latest version of Foxit PDF Reader
3. Install the update
4. Restart the application
🔧 Temporary Workarounds
Disable 3D content in Foxit Reader
allPrevents parsing of U3D/PRC content that triggers the vulnerability
Open Foxit Reader > File > Preferences > Security > Uncheck 'Enable 3D'
Use alternative PDF viewer
allTemporarily use a different PDF reader until patched
🧯 If You Can't Patch
- Implement application whitelisting to block execution of Foxit Reader
- Use email/web filtering to block PDF attachments and downloads
🔍 How to Verify
Check if Vulnerable:
Check Foxit Reader version against the patched version in the vendor advisoryCheck Version:
Windows: Open Foxit Reader > Help > About; macOS/Linux: Check application info or package managerVerify Fix Applied:
Verify Foxit Reader version matches or exceeds the patched version📡 Detection & Monitoring
Log Indicators:
- Application crash logs from Foxit Reader
- Memory access violation errors in system logs
Network Indicators:
- PDF file downloads from untrusted sources
- Email attachments with PDF files
SIEM Query:
source="*foxit*" AND (event_type="crash" OR error="access_violation")