What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-06 · updated 2026-10-24
• Weakness: CWE-820

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.

Affected products

• hfiref0x LightFTP: through 2.4

References

• https://github.com/hfiref0x/LightFTP/issues/75
• https://www.vulncheck.com/advisories/lightftp-data-race-condition-via-abor-command-in-ftpserv-c

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