CVE-2025-63757
📋 TL;DR
An integer overflow vulnerability in FFmpeg's libswscale component allows attackers to cause heap corruption when processing specially crafted YUV video files. This affects any application using FFmpeg 8.0 for video processing or conversion. The vulnerability could lead to denial of service or potentially remote code execution.
💻 Affected Systems
- FFmpeg
- Applications using FFmpeg libraries
- Media processing tools built on FFmpeg
📦 What is this software?
Ffmpeg by Ffmpeg
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise of the FFmpeg process, potentially allowing attacker to execute arbitrary code with the privileges of the FFmpeg process.
Likely Case
Application crash (denial of service) when processing malicious video files, potentially disrupting video processing services or media applications.
If Mitigated
Controlled crash with no privilege escalation if proper sandboxing and privilege separation are implemented.
🎯 Exploit Status
Proof of concept available in GitHub gist demonstrates crash. Full weaponization for RCE would require additional heap manipulation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: FFmpeg 8.1 or later
Vendor Advisory: https://ffmpeg.org/security.html
Restart Required: Yes
Instructions:
1. Update FFmpeg to version 8.1 or later. 2. Rebuild any applications using FFmpeg libraries. 3. Restart services using FFmpeg.
🔧 Temporary Workarounds
Disable YUV processing for untrusted files
allConfigure applications to reject or skip YUV format processing for untrusted input files
Run FFmpeg in sandboxed environment
linuxExecute FFmpeg with reduced privileges using containerization or sandboxing
docker run --security-opt=no-new-privileges -u nobody ffmpeg
🧯 If You Can't Patch
- Implement strict input validation to reject malformed video files before FFmpeg processing
- Run FFmpeg processes with minimal privileges and in isolated environments
🔍 How to Verify
Check if Vulnerable:
Check FFmpeg version: ffmpeg -version | grep 'FFmpeg version' and verify if it's 8.0Check Version:
ffmpeg -version | grep 'FFmpeg version'Verify Fix Applied:
Verify FFmpeg version is 8.1 or later: ffmpeg -version | grep 'FFmpeg version'📡 Detection & Monitoring
Log Indicators:
- FFmpeg process crashes with segmentation fault
- Abnormal termination of video processing services
- Error logs mentioning libswscale or heap corruption
Network Indicators:
- Multiple failed video upload attempts
- Unusual video file upload patterns
SIEM Query:
process.name:ffmpeg AND (event.action:crash OR exit_code:139)