CVE-2026-70637
LightFTP 2.4 Data Race Condition via ABOR Command in ftpserv.c
CVSS Score
5.9
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-820 |
| Vendor | hfiref0x |
| Product | lightftp |
| Published | Aug 6, 2026 |
| Last Updated | Aug 6, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
hfiref0x / LightFTP
0 ≤ 2.4 0 ≤ d28c5e08aa4bd128737d35cc6ee0f9630a910ed5
References
Credits
grant_Y (@grant-yim) 🔍 Gjoko Krstic of Zero Science Lab