CVE-2026-70637
LightFTP 2.4 Data Race Condition via ABOR Command in ftpserv.c
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| LightFTP hfiref0x hfiref0x/LightFTP
github |
≥ 0; ≤ 2.4 (affected, custom) ≥ 0; ≤ d28c5e08aa4bd128737d35cc6ee0f9630a910ed5 (affected, git) Other versions: affected |
CNA: VulnCheck |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 8.2 high |
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 | CNA: VulnCheck |
| 3.1 / 5.9 medium |
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H | CNA: VulnCheck |
Exploit evidence
- https://github.com/hfiref0x/LightFTP/issues/75
exploit · CNA: VulnCheck
References
- https://github.com/hfiref0x/LightFTP/issues/75CNA: VulnCheck · technical-description, exploit, issue-tracking
- https://www.vulncheck.com/advisories/lightftp-data-race-condition-via-abor-command-in-ftpserv-cCNA: VulnCheck · third-party-advisory
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