CVE-2026-70637
LightFTP 2.4 Data Race Condition via ABOR Command in ftpserv.c
- State
- Published
- Severity
- 8.2 High
- Published
- Aug 6, 2026
- Updated
- Aug 14, 2026
- Reserved
- Aug 4, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 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 | 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 | VulnCheck |
Weaknesses
- CWE-820 Missing Synchronization
Affected Products
| Product | Versions |
|---|---|
LightFTPhfiref0x |
|
References
- Researcher Disclosuretechnical-descriptionexploit
- https://www.vulncheck.com/advisories/lightftp-data-race-condition-via-abor-command-in-ftpserv-cthird-party-advisory
Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.