Read the docs
TI-2026-49347 Aliases CVE-2026-70637GHSA-6269-2q48-xxqm

LightFTP 2.4 Data Race Condition via ABOR Command in ftpserv.c

Priority HIGH 69CWE-820Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00365 30th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
hfiref0xLightFTPup to 2.4—No fix listedCNA
  • LightFTP Vendorhfiref0x Affected up to 2.4 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-70637
  2. 2026-10-03 Alias added: GHSA-6269-2q48-xxqm

References

Exploit 1

  • TI-2026-47761 LightFTP 2.3.1 Race Condition DoS via worker_thread_cleanup CVSS 4.0HIGH 8.2
  • TI-2023-09823 A race condition in LightFTP through 2.2 allows an attacker to achieve path traversal via… CVSS 3.1HIGH 7.5
  • TI-2025-40345 A buffer overflow in the g_cfg.MaxUsers component of LightFTP v2.0 allows attackers to… CVSS 3.1MEDIUM 6.5
  • TI-2017-14535 LightFTP version 1.1 is vulnerable to a buffer overflow in the "writelogentry" function… CVSS 3.0CRITICAL 9.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences