CVE-2026-70637
MediumCVSS 5.9Exploitation Probability (EPSS)
Low risk13th percentile - higher than 13% of all known CVEs
Summary
LightFTP through 2.4 contains multiple data race vulnerabilities in ftpserv.c that allow anonymous attackers to cause undefined behavior by issuing LIST followed by ABOR commands without authentication. The control thread closes data_socket and file_fd descriptors while worker threads concurrently operate on the same fields in worker_thread_cleanup, allowing stale file descriptors to be reassigned by the OS and subsequently used by worker threads on unrelated resources, resulting in potential denial of service.
Risk Assessment
An attacker can cause the FTP service to crash or behave unpredictably, leading to service unavailability. Additionally, data integrity may be compromised if descriptors are used on wrong resources.
Recommendation
It is recommended to upgrade LightFTP to a version newer than 2.4 if a fix is available. Also, consider requiring authentication for LIST and ABOR commands and restricting anonymous access.
Other vulnerabilities in LightFTP
See all- CVE-2017-1000218Critical
LightFTP version 1.1 is vulnerable to a buffer overflow in the 'writelogentry' function resulting in denial of service or remote code execution.
- CVE-2026-67607Medium
LightFTP 2.3.1 contains an incomplete fix for CVE-2024-11144, leaving a race condition in the worker_thread_cleanup() function. A remote unauthenticated attacker can send a LIST command followed by ABOR, causing daemon instability or crash (denial of service).
Original NVD description (English source)
LightFTP through 2.4 contains multiple data race vulnerabilities in ftpserv.c that allow anonymous attackers to cause undefined behavior by issuing LIST followed by ABOR commands without authentication. The control thread closes data_socket and file_fd descriptors while worker threads concurrently operate on the same fields in worker_thread_cleanup, allowing stale file descriptors to be reassigned by the OS and subsequently used by worker threads on unrelated resources, resulting in potential denial of service.