What is CVE-2026-70637?

CVE-2026-70637 is a medium-severity vulnerability in Hfiref0x Lightftp, classified under CWE-820. CVSS score: 5.9/10. Published 2026-08-06.

How severe is CVE-2026-70637?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Hfiref0x Lightftp

CVE-2026-70637

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_socke…

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Hfiref0x Lightftp — versions 0

Weakness classification (CWE)

CWE-820

References

disclosure@vulncheck.com (technical-description, exploit)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-70637?: CVE-2026-70637 is a medium-severity vulnerability in Hfiref0x Lightftp, classified under CWE-820. CVSS score: 5.9/10. Published 2026-08-06.
How severe is CVE-2026-70637?: Medium severity. CVSS v3 base score is 5.9 out of 10.