Vulnerability Description
LightFTP 2.3.1 contains a residual race condition vulnerability (an incomplete fix for CVE-2024-11144) in the worker_thread_cleanup() function of ftpserv.c that allows remote unauthenticated attackers to destabilize or crash the daemon by triggering unsynchronized access to shared per-connection state without holding the required mutex lock. Attackers can send a data-transfer command such as LIST followed immediately by ABOR to exploit the missing synchronization on shared context and detached thread id reuse, resulting in daemon destabilization or crash which can lead to a denial of service. The 2.3.1 patch only narrowed the timing window (an extra re-check and reordered cleanup), it never added the missing lock, so the underlying race remains.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/zeroscience/tuktam#real-world-case-study-lightftp-cve-2024-11
- https://www.vulncheck.com/advisories/lightftp-race-condition-dos-via-worker-thre
- https://github.com/zeroscience/tuktam#real-world-case-study-lightftp-cve-2024-11
FAQ
What is CVE-2026-67607?
CVE-2026-67607 is a vulnerability with a CVSS score of 5.9 (MEDIUM). LightFTP 2.3.1 contains a residual race condition vulnerability (an incomplete fix for CVE-2024-11144) in the worker_thread_cleanup() function of ftpserv.c that allows remote unauthenticated attackers...
How severe is CVE-2026-67607?
CVE-2026-67607 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-67607?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.