CVE-2024-4040
CrushFTP VFS Sandbox Escape Vulnerability
CrushFTP CrushFTP
A server side template injection vulnerability in CrushFTP in all versions before 10.7.1 and 11.1.0 on all platforms allows unauthenticated remote attackers to read files from the filesystem outside of the VFS Sandbox, bypass authentication to gain administrative access, and perform remote code execution on the server.
Exploitation status
CISA Known Exploited Vulnerabilities
Listed by CISA on 24 April 2024. US federal agencies were required to remediate it by 1 May 2024.
EPSS — exploitation probability
FIRST puts the probability of exploitation activity in the next 30 days at 99.5%, 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:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Frequently asked questions
Is CVE-2024-4040 being exploited by ransomware groups?
No ransomware group in this database is currently recorded as exploiting CVE-2024-4040.
What does CVE-2024-4040 affect?
CVE-2024-4040 affects CrushFTP CrushFTP. A server side template injection vulnerability in CrushFTP in all versions before 10.7.1 and 11.1.0 on all platforms allows unauthenticated remote attackers to read files from the filesystem outside of the VFS Sandbox, bypass authentication to gain administrative access, and perform remote code execution on the server.
How severe is CVE-2024-4040?
CVE-2024-4040 is rated CRITICAL with a CVSS base score of 9.8. EPSS puts the probability of exploitation in the next 30 days at 99.5%, higher than 99.9% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 1 May 2024.
How should organisations respond to CVE-2024-4040?
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.