CVE-2025-2751
📋 TL;DR
This vulnerability in Assimp's CSM file handler allows remote attackers to trigger an out-of-bounds read by manipulating the 'na' argument. This could lead to information disclosure or application crashes. Any application using Assimp 5.4.3 to process CSM files from untrusted sources is affected.
💻 Affected Systems
- Open Asset Import Library (Assimp)
📦 What is this software?
Assimp by Assimp
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution through memory corruption, though unlikely given the CVSS score and CWE classification as out-of-bounds read rather than write.
Likely Case
Application crash (denial of service) or information disclosure through memory leaks.
If Mitigated
Minimal impact if proper input validation and memory protections are in place.
🎯 Exploit Status
Exploit has been publicly disclosed in GitHub issues. Remote exploitation requires delivering a malicious CSM file.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check latest Assimp release or GitHub issues for specific fix version
Vendor Advisory: https://github.com/assimp/assimp/issues/6012
Restart Required: Yes
Instructions:
1. Check Assimp GitHub for latest release
2. Update to patched version
3. Recompile/redeploy applications using Assimp
4. Restart affected services
🔧 Temporary Workarounds
Disable CSM file processing
allRemove or disable CSM file handler if not needed
Recompile Assimp with CSM support disabled or modify configuration
Input validation
allImplement strict validation of CSM files before processing
🧯 If You Can't Patch
- Implement network filtering to block CSM files from untrusted sources
- Use application sandboxing/containerization to limit impact
🔍 How to Verify
Check if Vulnerable:
Check Assimp version and if CSM file handler is enabledCheck Version:
assimp version or check library version in applicationVerify Fix Applied:
Test with proof-of-concept CSM file from GitHub issue📡 Detection & Monitoring
Log Indicators:
- Application crashes when processing CSM files
- Memory access violation errors
Network Indicators:
- Incoming CSM files from untrusted sources
SIEM Query:
Search for 'assimp' AND ('crash' OR 'segmentation fault') in application logs