CVE-2025-54309
CrushFTP Unprotected Alternate Channel Vulnerability
CrushFTP CrushFTP
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.
Exploitation status
CISA Known Exploited Vulnerabilities
Listed by CISA on 22 July 2025. US federal agencies were required to remediate it by 12 August 2025.
EPSS — exploitation probability
FIRST puts the probability of exploitation activity in the next 30 days at 95.1%, which is higher than 99.9% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Frequently asked questions
Is CVE-2025-54309 being exploited by ransomware groups?
No ransomware group in this database is currently recorded as exploiting CVE-2025-54309.
What does CVE-2025-54309 affect?
CVE-2025-54309 affects CrushFTP CrushFTP. 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.
How severe is CVE-2025-54309?
CVE-2025-54309 is rated CRITICAL with a CVSS base score of 9. EPSS puts the probability of exploitation in the next 30 days at 95.1%, higher than 99.9% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 12 August 2025.
How should organisations respond to CVE-2025-54309?
Apply the vendor patch for CrushFTP CrushFTP as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.