CVE-2026-70637
Race condition in LightFTP allows anonymous LIST+ABOR to trigger DoS.
Is CVE-2026-70637 being exploited?
Not confirmed. CVE-2026-70637 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.23% probability of exploitation in the next 30 days.
How severe is CVE-2026-70637?
CVE-2026-70637 is rated High with a CVSS score of 8.2. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-70637?
Not known from our data. No patch reference has been recorded for CVE-2026-70637, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-70637 affect?
CVE-2026-70637 affects LightFTP <= 2.4, Servers running LightFTP ftpserv.c. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-70637?
Apply vendor patch when released; disable anonymous FTP and block LIST/ABOR from untrusted sources.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Anonymous attacker can race LIST followed by ABOR to cause stale FD reuse, undefined behavior, and denial of service on LightFTP servers.
Patch when possible
- affected<= 2.4
- affected<= d28c5e08aa4bd128737d35cc6ee0f9630a910ed5
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.