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CVE-2026-70637— LightFTP 2.4 Data Race Condition via ABOR Command in ftpserv.c

Quick assessment

Affected
hfiref0x LightFTP
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

hfiref0x LightFTP是hfiref0x个人开发者开源的一个轻量级FTP服务。 hfiref0x LightFTP 2.4及之前版本存在竞争条件问题漏洞，该漏洞源于ftpserv.c存在多个数据竞争漏洞，控制线程关闭data_socket和file_fd描述符时工作线程并发操作相同字段，导致失效文件描述符可能被操作系统重新分配并被工作线程用于无关资源，可能导致拒绝服务。

CVSS 5.9 · Medium EPSS 0.23% · P14

Affected Version Matrix 2

VendorProduct Version RangeStatus
hfiref0x LightFTP ≤ 2.4 affected
≤ d28c5e08aa4bd128737d35cc6ee0f9630a910ed5 affected
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I. Basic Information for CVE-2026-70637

Vulnerability Information
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Vulnerability Title
LightFTP 2.4 Data Race Condition via ABOR Command in ftpserv.c
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
缺失同步机制
Source: CVE Program / CVE List V5
Vulnerability Title
hfiref0x LightFTP 竞争条件问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
hfiref0x LightFTP是hfiref0x个人开发者开源的一个轻量级FTP服务。 hfiref0x LightFTP 2.4及之前版本存在竞争条件问题漏洞，该漏洞源于ftpserv.c存在多个数据竞争漏洞，控制线程关闭data_socket和file_fd描述符时工作线程并发操作相同字段，导致失效文件描述符可能被操作系统重新分配并被工作线程用于无关资源，可能导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
hfiref0x LightFTP 0 ~ 2.4 -

II. Public POCs for CVE-2026-70637

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III. Intelligence Information for CVE-2026-70637

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Vendor Advisories for CVE-2026-70637 (2)

IV. Related Vulnerabilities

Same product: LightFTP
Same vendor: hfiref0x
Same weakness: CWE-820

V. Comments for CVE-2026-70637

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