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.
History

Thu, 06 Aug 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 06 Aug 2026 17:45:00 +0000

Type Values Removed Values Added
First Time appeared Hfiref0x
Hfiref0x lightftp
Vendors & Products Hfiref0x
Hfiref0x lightftp

Thu, 06 Aug 2026 14:45:00 +0000

Type Values Removed Values Added
Description 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.
Title LightFTP 2.4 Data Race Condition via ABOR Command in ftpserv.c
Weaknesses CWE-820
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.2, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published: 2026-08-06T14:15:09.693Z

Updated: 2026-08-06T17:24:13.060Z

Reserved: 2026-08-04T20:17:18.298Z

Link: CVE-2026-70637

cve-icon Vulnrichment

Updated: 2026-08-06T17:24:07.133Z

cve-icon NVD

No data.

cve-icon Redhat

No data.