CVE-2026-70637
MEDIUMDescription
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.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Exploit Intelligence
Low risk: more likely to be exploited than 13% of all known CVEs.
References
Related Vulnerabilities
Other CWE-820 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2023-2801 | High | 7.5 | 0.7% | - | Fix |
| CVE-2024-49114 | High | 7.8 | 0.7% | - | Fix |
| CVE-2025-47154 | Critical | 9.0 | 0.7% | - | - |
| CVE-2025-49751 | Medium | 6.8 | 0.5% | - | Fix |
| CVE-2025-47999 | Medium | 6.8 | 0.4% | - | Fix |
| CVE-2025-1445 | High | 7.5 | 0.3% | - | - |
Common questions
How do I fix CVE-2026-70637?
No published fix for CVE-2026-70637 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2026-70637 being actively exploited?
Not that we know of. CVE-2026-70637 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.23% is the estimated probability that it will be exploited in the next 30 days. That is higher than 13% of all scored CVEs.
How severe is CVE-2026-70637?
CVE-2026-70637 has a CVSS v3 base score of 5.9, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-08-06.