CVE-2025-54309: CrushFTP Unprotected Alternate Channel Vulnerability

Critical severity, CVSS 9.8. Actively exploited: in CISA KEV since 2025-07-22. EPSS: 95.1% chance of exploitation in the next 30 days.

CrushFTP 10 before 10.8.5 and 11 before 11.3.4_23, when the DMZ proxy feature is not used, mishandles AS2 validation and consequently allows remote attackers to obtain admin access via HTTPS, as exploited in the wild in July 2025.

Affected products

• CrushFTP CrushFTP: from 10.0.0, before 10.8.5 (fixed in 10.8.5); from 11.0.0, before 11.3.4_23 (fixed in 11.3.4_23)

Published 2025-07-18. Last modified 2026-06-17.