CVE-2025-50518
📋 TL;DR
A use-after-free vulnerability in libcoap's coap_delete_pdu_lkd function allows memory corruption when applications misuse the library. This could lead to arbitrary code execution or crashes. Only applications using libcoap incorrectly are affected, as the supplier disputes this is a library vulnerability.
💻 Affected Systems
- libcoap
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to full system compromise if exploited successfully.
Likely Case
Application crashes or denial of service due to memory corruption.
If Mitigated
No impact if applications use libcoap correctly per documentation.
🎯 Exploit Status
Exploitation requires specific application misuse patterns and memory manipulation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: N/A
Vendor Advisory: https://github.com/obgm/libcoap/issues/1724
Restart Required: No
Instructions:
Ensure applications use libcoap APIs correctly per documentation. Review application code for proper PDU handling.
🔧 Temporary Workarounds
Application Code Review
allAudit application code for proper use of coap_delete_pdu_lkd and related functions
Review application source code for libcoap API usage patterns
🧯 If You Can't Patch
- Isolate affected applications in restricted network segments
- Implement strict input validation and memory usage monitoring
🔍 How to Verify
Check if Vulnerable:
Review application source code for improper coap_delete_pdu_lkd usage patternsCheck Version:
Check libcoap version with: pkg-config --modversion libcoap-3Verify Fix Applied:
Code review confirms proper PDU lifecycle management📡 Detection & Monitoring
Log Indicators:
- Application crashes with memory corruption errors
- Segmentation faults in libcoap processes
Network Indicators:
- Unusual CoAP traffic patterns triggering memory issues
SIEM Query:
Process crashes with libcoap in stack trace