CVE-2026-70637— LightFTP 2.4 Data Race Condition via ABOR Command in ftpserv.c
Possible ATT&CK Techniques 2AI
T1210 · Exploitation of Remote Services T1499 · Endpoint Denial of ServiceGet alerts for future matching vulnerabilitiesLog in to subscribe
I. Basic Information for CVE-2026-70637
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗ Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
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
II. Public POCs for CVE-2026-70637
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POCPremium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-70637
请登录查看更多情报信息。
Vendor Advisories for CVE-2026-70637 (2)
IV. Related Vulnerabilities
Same weakness: CWE-820
- CVE-2026-57029
Junos OS Evolved: QFX Series: When sFlow collector reachabil - CVE-2026-22163
GPU DDK - Unsafe writing of MMU PT entries on systems with 3 - CVE-2022-50238
Microsoft Windows Defender Application Control 安全漏洞 - CVE-2025-49751
Windows Hyper-V Denial of Service Vulnerability - CVE-2025-47999
Windows Hyper-V Denial of Service Vulnerability
V. Comments for CVE-2026-70637
No comments yet